Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a8577d43e032e7…

MALICIOUS

PDF

45.5 KB Created: 2020-07-22 17:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28f9d37099ec0de0578bb3e7ef28104e SHA-1: a2a87ba6dae5945e96efd192b6d052097357b02f SHA-256: 72a8577d43e032e7c0f041dfd016129df14855a6cd9cd1bf1032ff1a21160a60
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination of the malicious payload. The document also hosts a large number of other PDF links, suggesting a link farm for SEO manipulation or to spread malicious content. The ML classifier strongly indicates maliciousness.

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/wb?keyword=opponent%20process%20theory%20of%20emotion%20pdf
    • http://files.innovationsbuildingservices.com/uploads/1/3/1/4/131438741/3ca2f8128cf.pdf
    • http://files.sevenstarsamerica.org/uploads/1/3/1/3/131381946/b611fbf946e4c.pdf
    • http://files.kauaifoodofthegods.com/uploads/1/3/1/3/131381946/wogojujedoz.pdf
    • http://files.daandersonlaw.org/uploads/1/3/1/3/131380279/ratogovipinono.pdf
    • http://files.sunburstmusic.org/uploads/1/3/1/3/131383453/1802692.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9413/8268/files/28251566735.pdf
    • https://cdn.shopify.com/s/files/1/0436/1060/3677/files/donanofazolejejuxekuke.pdf
    • https://cdn.shopify.com/s/files/1/0433/6173/0719/files/valuwomiwoga.pdf
    • https://cdn.shopify.com/s/files/1/0433/8342/3126/files/24932776538.pdf
    • https://xobajowupoda.files.wordpress.com/2020/06/faligikojeduliluvigivap.pdf
    • https://kutikoxesodu.files.wordpress.com/2020/07/lekisezinurabijaze.pdf
    • https://zabalojiji.files.wordpress.com/2020/06/44065247792.pdf
    • https://cdn.shopify.com/s/files/1/0428/5172/9567/files/wikugeva.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3592/files/ruwelogoji.pdf
    • https://cdn.shopify.com/s/files/1/0428/7895/9775/files/sozefomiro.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93527538138.pdf
    • https://cdn.shopify.com/s/files/1/0430/5528/4378/files/wasup.pdf
    • https://cdn.shopify.com/s/files/1/0429/1608/5923/files/36496392073.pdf
    • https://cdn.shopify.com/s/files/1/0430/7383/1073/files/63607718755.pdf
    • https://cdn.shopify.com/s/files/1/0433/1818/2041/files/kirabowaramokaduweraxefe.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_off00007583.bin
d60eeb66ab2ec88891c77709ce3218a1f3ccf031e0a2c704dab1f314aeca5fed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7583 5068 bytes
font_01_sfnt_off00008692.bin
a7820286cbfcb8b690568db0841f007f0fddb82d8eb39824cdc70556d51627ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8692 9948 bytes

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