Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6645c330410e3e4…

MALICIOUS

PDF

62.4 KB Created: 2020-08-11 04:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c90101c61585d33b13ee393d84f4808b SHA-1: 54be8a55567883060594a2e610ddbd423b3f7262 SHA-256: f6645c330410e3e41cea19a8e4fca10b767d807f31b21b78010f5bae0f3caf10
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=algebraic+identities+questions+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on cdn.shopify.com. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing the intent to redirect the user.

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=algebraic+identities+questions+pdf
    • http://files.dianeperell.com/uploads/1/3/1/4/131453194/durokajepavutori.pdf
    • http://bunelodu.southgatecc.net/uploads/1/3/1/6/131637016/3286199.pdf
    • http://bejoxutiz.michaelparishchurch.com/uploads/1/3/2/7/132740541/026677.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5774/files/84990931335.pdf
    • https://cdn.shopify.com/s/files/1/0431/2629/2629/files/60872161041.pdf
    • https://cdn.shopify.com/s/files/1/0431/7675/5349/files/converter_to_word_online_zamzar.pdf
    • https://cdn.shopify.com/s/files/1/0436/4494/4542/files/dadofubazeriko.pdf
    • https://cdn.shopify.com/s/files/1/0438/3444/1885/files/51567549392.pdf
    • https://cdn.shopify.com/s/files/1/0431/3910/4917/files/27466127365.pdf
    • https://cdn.shopify.com/s/files/1/0429/3092/9827/files/93407224916.pdf
    • https://cdn.shopify.com/s/files/1/0429/4855/9004/files/fur_elise_piano_notes_easy.pdf
    • https://cdn.shopify.com/s/files/1/0438/5013/7760/files/badositigume.pdf
    • https://cdn.shopify.com/s/files/1/0432/6575/3241/files/makkar_ielts_speaking_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/1663/2992/files/normal_cdf_and.pdf
    • https://cdn.shopify.com/s/files/1/0435/3910/3912/files/bibbulmun_track_map.pdf
    • https://cdn.shopify.com/s/files/1/0437/1808/2711/files/clinical_bacteriology_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/1666/7815/files/33986745894.pdf
    • https://cdn.shopify.com/s/files/1/0434/5203/9328/files/73317852660.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009db8.bin
61ae830689408e023490dca435a20b9da23c67bea81c18575846468ddf3ae06a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DB8 5460 bytes
font_01_sfnt_off0000b041.bin
6e57d13f436bfe5fd152c741d3afe6e99643b06c210757691c257203474ad588		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB041 14268 bytes
font_02_sfnt_off0000ddc2.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC2 4324 bytes

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