Malicious PDF — malware analysis report

Static analysis result for SHA-256 733be81a9d61ade3…

MALICIOUS

PDF

50.4 KB Created: 2020-08-17 16:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb0d313634e7ac9af7079f062f2c6385 SHA-1: f9172fa3fcbe2dcd69d17c0840c001f6b9025588 SHA-256: 733be81a9d61ade373de368cdacadbe7b297330f5536c6eaeb6bde1538b7f84d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link redirects to a known malicious domain (ttraff.ru). This suggests a link farm or SEO poisoning tactic designed to drive traffic to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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=bottomnavigationview+height+android
    • http://muxuz.faceeffect.shop/uploads/1/3/0/8/130813604/lepavusojulise_niropidesexiwoj_loluxodafi.pdf
    • http://files.831.delivery/uploads/1/3/1/4/131438180/zafilarul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/9861/2636/files/37744872084.pdf
    • https://cdn.shopify.com/s/files/1/0434/7048/7712/files/the_casebook_of_sherlock_holmes_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/0835/2679/files/fefajexepoxovixereloxewik.pdf
    • https://cdn.shopify.com/s/files/1/0432/9373/7118/files/3369448203.pdf
    • https://cdn.shopify.com/s/files/1/0432/0899/9072/files/36881053696.pdf
    • https://cdn.shopify.com/s/files/1/0428/3590/2631/files/bomafujuberurobedeg.pdf
    • https://cdn.shopify.com/s/files/1/0433/4419/9829/files/the_way_i_am_eminem_epub.pdf
    • https://cdn.shopify.com/s/files/1/0437/0097/7816/files/37714592229.pdf
    • https://cdn.shopify.com/s/files/1/0432/0185/5646/files/49218976921.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/mefimu.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a13.bin
7e2ab4f6147f295540a9691715172d164fb4e07bc6bb2f4418f85bb87466d18a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A13 5232 bytes
font_01_sfnt_off00008bbe.bin
cf6127f5d72151ad59f26582e175ac6d9c200a04660335a2187ff12127073335
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BBE 15792 bytes