Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a1e9aacd46c650…

MALICIOUS

PDF

42.3 KB Created: 2020-08-24 09:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d73d39fb432b678f3f190fd3c9298b8 SHA-1: a2aae9690381982fe191baca43e0da84b7181f4a SHA-256: 88a1e9aacd46c650f35491143110b39a44e44c9d832f3be57820c71daf153de3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, https://ttraff.ru/pify?keyword=6th+grade+worksheets+free+online, is flagged as a malicious redirector. The document body, though partially corrupted, also contains this URL and appears to be a lure for educational content. No scripts were extracted, but the heuristic firings strongly indicate malicious redirection and link-farming behavior.

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=6th+grade+worksheets+free+online
    • http://files.jackerjen.com/uploads/1/3/1/4/131483031/xikarukes.pdf
    • http://zubofabo.the413challenge.com/uploads/1/3/0/9/130969204/bamalujewebikajolal.pdf
    • http://files.singramed621.com/uploads/1/3/0/7/130776855/d3586035a.pdf
    • http://zilezoze.investwithsmdc.com/uploads/1/3/2/8/132814956/zutuzifixi.pdf
    • http://xipamixe.theedgeofthemap.net/uploads/1/3/0/7/130776257/5931ebc6ae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/12273273452.pdf
    • https://cdn.shopify.com/s/files/1/0429/9731/7785/files/ft-_857d_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/9818/6652/files/rigibozebuladalofinerusas.pdf
    • https://cdn.shopify.com/s/files/1/0462/6645/0074/files/41985718276.pdf
    • https://cdn.shopify.com/s/files/1/0431/1757/6354/files/batch_convert_ppt_to.pdf
    • https://cdn.shopify.com/s/files/1/0428/9832/5671/files/whitecat_osu_skin.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7064/files/womens_white_platform_tennis_shoes.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5800/files/jujemerasi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0291/2158/files/xexadizufenuzibina.pdf
    • https://cdn.shopify.com/s/files/1/0428/4802/6780/files/xenebugefifo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8704/4510/files/zoselovotoviwuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0523/8688/files/alfonsina_storni_poemas.pdf
    • https://cdn.shopify.com/s/files/1/0436/3019/8937/files/cal_poly_san_luis_obispo_campus_map.pdf
    • https://cdn.shopify.com/s/files/1/0434/3591/7464/files/lipoleburaz.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_off0000666e.bin
0801e1460ec661aefc3acc89d6517066463adc658f5228ff95d3dd81fa566177		 pdf-font-stream PDF embedded font (sfnt) at offset 0x666E 5384 bytes
font_01_sfnt_off000078c9.bin
d60b584d1943bee754c08b7cf550c911ed9d82c621eeba7780acea14b9056df7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78C9 10204 bytes

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