Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8cdddaaa4910f08…

MALICIOUS

PDF

59.9 KB Created: 2020-08-17 03:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1c3b748ab667adbd472ef57999cfcdfe SHA-1: 109cb809515d5ed0ab62890dd86ad5aced2158fe SHA-256: a8cdddaaa4910f08365995190b16f697c77b7c92adb3861d519a5f59502d28c4
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a lure related to an 'appointment letter' and includes a high number of external links, many hosted on Shopify. One critical heuristic indicates a malicious redirector link, and another points to a link farm. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=appointment+letter+format+for+engineering+college, which is likely the primary malicious destination. The presence of numerous links suggests an attempt to distribute malicious content or engage in SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=appointment+letter+format+for+engineering+college In PDF document text
    • http://files.jacquelinegreenough.com/uploads/1/3/1/3/131380225/gosogawavepex.pdfIn PDF document text
    • http://kawube.chevron.ie/uploads/1/3/0/7/130776021/joduvu_vubumufixaf.pdfIn PDF document text
    • http://pimuso.decorativedetails.co.uk/uploads/1/3/1/4/131452883/wedoxafapusibu.pdfIn PDF document text
    • http://files.coloradomineralandfossilshows.com/uploads/1/3/0/8/130814652/balewelazunubo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5851/1510/files/semantic_analogy_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/fenubupilegi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/how_to_open_console_in_tf2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1688/7192/files/ghana_choir_songs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5763/5735/files/xoxasunulazalonime.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4541/9170/files/96704575691.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5206/4155/files/mejuvufo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kuwuvovevikusezavufada.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3705/6414/files/24312872124.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8014/7359/files/gozafulukobapemozajunavab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3360/7842/files/vuzajixefi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1F9 2828 bytes
SHA-256: dd7b880f1c6958317b71933e3175eb4154b1281d355b69180e4ce829e506ee21
font_01_sfnt_off0000abf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABF3 5148 bytes
SHA-256: 4e03efccc602e82f331e2b88f01a01af3b7cc49cb07ed2d139495d021cbe4f08
font_02_sfnt_off0000bd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD54 10668 bytes
SHA-256: 3647444afdcfa3275bf49d624f9b453140df45649624bc80cc0f08d0fec88912