Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca66618d23d24d1…

MALICIOUS

PDF

38.6 KB Created: 2020-08-09 06:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6dbe51d441225368ba47bd0f9897928a SHA-1: 311cb3319d6679281dc32223e177967462400ba7 SHA-256: 1ca66618d23d24d1fc2cf28e96dcf6c15deed5df42275d61413c6491cf7edf7f
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links to external resources, masquerading as exercise materials. One of these links, 'https://ttraff.ru/pify?keyword=adjectives+and+adverbs+of+manner+exercises+pdf', points to a known malicious redirector. The document body is heavily obfuscated, but the presence of this malicious link and the heuristic firings indicate a phishing or redirection attempt. No scripts were extracted from this sample.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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=adjectives+and+adverbs+of+manner+exercises+pdf In PDF document text
    • http://reboze.jessicaharperyoga.com/uploads/1/3/1/4/131409090/jujamuduronugal.pdfIn PDF document text
    • http://files.capecodspeechlanguagepathologists.com/uploads/1/3/1/4/131483603/0db9440.pdfIn PDF document text
    • http://kejoxogis.jiaweitay.com/uploads/1/3/1/4/131454065/3250348.pdfIn PDF document text
    • http://files.stirlingguesthouse.co.uk/uploads/1/3/0/7/130776826/vawobunox.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/1/0434/7976/1061/files/53696986103.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2598/7741/files/32845576742.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4624/7332/files/51083091634.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/infectious_diseases_clinical_short_course.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2363/7402/files/momipexifefa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/97804527949.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/doxikiwivapodupikuvuku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0069/1879/files/defali.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/97828816348.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7315/8806/files/48668109292.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8482/5247/files/95631455930.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5109 5604 bytes
SHA-256: 933b669382dc105f32a128157d6e6cdb8c9649369169ad69cf6f1dfbbf751e33
font_01_sfnt_off0000640c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x640C 12932 bytes
SHA-256: 11a7562047f2ed3ccdc3977da06cc3caa35ebf8b7323ad78bbede0e03f3e993d