Malicious PDF — malware analysis report

Static analysis result for SHA-256 2126e4ad899b6f18…

MALICIOUS

PDF

47.0 KB Created: 2020-07-29 18:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed430755ed48cf21ffd5ce55b321eec8 SHA-1: fbeca836548d63da00da53d5b579706bc26df81b SHA-256: 2126e4ad899b6f189150dbedcde98d02797c49a8ccd52b0f9807b2ac4263bbb8
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits a PDF link farm heuristic, with numerous embedded URLs, the first of which is 'cdn.shopify.com/s/files/1/0431/2514/5760/files/tutif.pdf'. The ML classifier also strongly indicated maliciousness. These indicators suggest the document is designed to redirect users to malicious content, likely for phishing or malware distribution.

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=sintomas+de+baja+autoestima+pdf
    • http://files.esskayebooks.com/uploads/1/3/1/3/131398338/pifijosogegonapeg.pdf
    • http://files.patchesfamilycreamery.com/uploads/1/3/1/3/131380308/sugumidomifusu_mumopisisamigak_saxabudode_paxinebiv.pdf
    • http://files.sidcupbowlsclub.com/uploads/1/3/1/6/131606984/7106575.pdf
    • http://files.g6environmentalequipment.com/uploads/1/3/1/6/131606268/gosadupuxubuzimujaro.pdf
    • http://files.sacredibis.co/uploads/1/3/2/6/132680853/bitizit-xojawiz-bimifojisomeve-lamelofa.pdf
    • http://files.esskayebooks.com/upload
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/tutif.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4328/files/16901074687.pdf
    • https://cdn.shopify.com/s/files/1/0437/0045/3541/files/wemenudopaxepulisu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/wepomebox.pdf
    • https://cdn.shopify.com/s/files/1/0432/8646/2628/files/fitunoroxek.pdf
    • https://cdn.shopify.com/s/files/1/0431/8252/2528/files/96612612628.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13503036424.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/bepexubufox.pdf
    • https://cdn.shopify.com/s/files/1/0433/4675/5734/files/mezira.pdf
    • https://cdn.shopify.com/s/files/1/0434/3096/9511/files/pezaxilubulifabakimoriz.pdf
    • https://cdn.shopify.com/s/files/1/0433/3908/8027/files/gogewonifux.pdf
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/76993353512.pdf
    • https://cdn.shopify.com/s/files/1/0436/9691/4600/files/kiworunasikojobuzenamib.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_off00007808.bin
f2902ccf65dabcbbd5db792802a51421d456e095fe80fc3a58bf560145a36533		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7808 5260 bytes
font_01_sfnt_off000089c4.bin
46d7711d3f31562429b954c417d53710ca0bb6ed5194cdb4475d9a5d619bbb08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89C4 10976 bytes

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