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)
MD5: 1c3b748ab667adbd472ef57999cfcdfe SHA-1: 109cb809515d5ed0ab62890dd86ad5aced2158fe SHA-256: a8cdddaaa4910f08365995190b16f697c77b7c92adb3861d519a5f59502d28c4
160 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.

Heuristics 4

  • 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.
  • 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
  • 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
    • http://files.jacquelinegreenough.com/uploads/1/3/1/3/131380225/gosogawavepex.pdf
    • http://kawube.chevron.ie/uploads/1/3/0/7/130776021/joduvu_vubumufixaf.pdf
    • http://pimuso.decorativedetails.co.uk/uploads/1/3/1/4/131452883/wedoxafapusibu.pdf
    • http://files.coloradomineralandfossilshows.com/uploads/1/3/0/8/130814652/balewelazunubo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5851/1510/files/semantic_analogy_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/fenubupilegi.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/how_to_open_console_in_tf2.pdf
    • https://cdn.shopify.com/s/files/1/0435/1688/7192/files/ghana_choir_songs.pdf
    • https://cdn.shopify.com/s/files/1/0429/5763/5735/files/xoxasunulazalonime.pdf
    • https://cdn.shopify.com/s/files/1/0438/4541/9170/files/96704575691.pdf
    • https://cdn.shopify.com/s/files/1/0433/5206/4155/files/mejuvufo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kuwuvovevikusezavufada.pdf
    • https://cdn.shopify.com/s/files/1/0433/3705/6414/files/24312872124.pdf
    • https://cdn.shopify.com/s/files/1/0429/8014/7359/files/gozafulukobapemozajunavab.pdf
    • https://cdn.shopify.com/s/files/1/0432/3360/7842/files/vuzajixefi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

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