Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e8acd14ee66346…

MALICIOUS

PDF

44.7 KB Created: 2020-08-04 19:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3903f73b62eb76406f3af157bd7cc691 SHA-1: 5ed592dbd80baa17bc5708d1514bcce47dbd57d6 SHA-256: c5e8acd14ee663467ac021319fb29b10a70459c4fbc518bc17a2356f4dbc1c4f
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised with a keyword related to pregnancy medication. The document also features a large number of external PDF links, many hosted on cdn.shopify.com, suggesting an SEO link farm tactic. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious redirector and the link farm strategy indicate a likely phishing or malware distribution attempt.

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.com/pify?keyword=antiacidos+para+embarazadas+pdf
    • http://balez.theherosheart.com/uploads/1/3/1/1/131164312/bf93d5.pdf
    • http://files.fionasremedialmassage.com/uploads/1/3/2/6/132695734/4212506.pdf
    • http://files.israylcommonwealthministries.org/uploads/1/3/0/8/130814682/6512879.pdf
    • http://files.esoteric-alchemy.com/uploads/1/3/0/9/130969591/b2d1824701a2ec.pdf
    • http://files.elitepowerinvestigations.com/uploads/1/3/2/7/132710601/mowowuzugipimig_metimagewonije_xumuxigovugo_nisosugepegogi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vakijuxek.pdf
    • https://cdn.shopify.com/s/files/1/0438/3539/2150/files/mavepine.pdf
    • https://cdn.shopify.com/s/files/1/0439/3802/1531/files/automata_theory_languages_and_computation_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/6488/5397/files/22504074176.pdf
    • https://cdn.shopify.com/s/files/1/0431/2249/1541/files/warhammer_40k_eldar_codex_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/3095/3630/files/libro_amando_a_pablo_odiando_a_escobar_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/nozamulibijatalakijenofe.pdf
    • https://cdn.shopify.com/s/files/1/0438/6632/5157/files/88241536571.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7752/files/widegugopekaviwusitutuvo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9845/5705/files/ancient_egyptian_symbols.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/61403973964.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/tutosajapavitos.pdf
    • https://cdn.shopify.com/s/files/1/0434/3028/1381/files/separation_agreement_ma.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_off00006cef.bin
4515362f0d09d044a2d8fbb976e0bee72a97ee58f2971cec524d43554452b424		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CEF 5448 bytes
font_01_sfnt_off00007f67.bin
a1fb842b4c06cfc29a141e1b50cbda5d1d765df3c255918b0a59204eaf2e85b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F67 11352 bytes

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