Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c4707ddc1770fc…

MALICIOUS

PDF

42.1 KB Created: 2020-08-06 11:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5e252de40aef34c5a2ae8be40c92a0f SHA-1: 718c93f9a73d075e585d71af71fe7603e734c2d1 SHA-256: a1c4707ddc1770fc0f66ec0a4df331f97516b976bfa717f1e8314003f3f18e83
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is used to obscure the final destination. The document body itself contains garbled text along with the malicious redirector URL and several Shopify URLs, indicating a lure to download further content. No scripts were extracted from this sample.

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.cc/pify?keyword=miocardiopatia+dilatada+adultos+pdf
    • http://files.andreadoylemusic.com/uploads/1/3/0/7/130775292/1294fe626014e.pdf
    • http://josageto.maileandrus-price.com/uploads/1/3/1/0/131070109/2000ef.pdf
    • http://files.immaculataschool.org/uploads/1/3/0/7/130775603/gowixigurevego-beposozamubut-muvex.pdf
    • http://files.kelseyjbowen.com/uploads/1/3/0/7/130776611/zufaladumokojemizozo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7212/6117/files/vaxumijuxurezedawim.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84005007378.pdf
    • https://cdn.shopify.com/s/files/1/0431/9304/1059/files/digelumuzixowunep.pdf
    • https://cdn.shopify.com/s/files/1/0430/8133/4933/files/xebazamuzelapujewe.pdf
    • https://cdn.shopify.com/s/files/1/0427/4041/6678/files/kopazilibutizasofazetuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nunixa.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/the_american_inferno.pdf
    • https://cdn.shopify.com/s/files/1/0431/8376/7713/files/59283758851.pdf
    • https://cdn.shopify.com/s/files/1/0434/5764/2648/files/asma_gina_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0427/8432/5798/files/4224735572.pdf
    • https://cdn.shopify.com/s/files/1/0435/6335/2227/files/51663209452.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006459.bin
cda9437cd679c77e7430a1655c474e4b426bfddf562be379167afa99d6f019e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6459 5156 bytes
font_01_sfnt_off000075fa.bin
03d2fe53eecb876f424a22eed93825b3911b876a57576c122404f3c74887a210
pdf-font-stream PDF embedded font (sfnt) at offset 0x75FA 11032 bytes