Malicious PDF — malware analysis report

Static analysis result for SHA-256 814aa1faab8127c1…

MALICIOUS

PDF

41.1 KB Created: 2020-07-28 19:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa98649239832d06d38747b717eebd91 SHA-1: 106fbd14e67cb27cb022ce854920b6c8df156342 SHA-256: 814aa1faab8127c1a0b27095b4eb655ee8eb80c53f4c8505451f1763b87e5a42
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. Another critical heuristic identified a PDF link farm hosted on Shopify, suggesting an attempt to manipulate search engine results or lure users to malicious content. The ML classifier strongly supports the malicious nature of this PDF. The primary malicious IOC is the redirector URL.

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=customer+experience+design+powerpoint+template
    • http://files.westwoodvolunteerems.org/uploads/1/3/2/6/132682110/pukodavekesuz.pdf
    • http://files.risecorpuschristi.org/uploads/1/3/0/8/130813834/8165255.pdf
    • http://files.schrodingeracademy.org/uploads/1/3/1/4/131437446/5746945.pdf
    • http://files.jennybirmelin.com/uploads/1/3/1/3/131379724/7972088.pdf
    • http://files.moonrockman.com/uploads/1/3/1/3/131383588/01c44b6d.pdf
    • https://cdn.shopify.com/s/files/1/0428/2161/5775/files/75673479612.pdf
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/talefuwim.pdf
    • https://cdn.shopify.com/s/files/1/0429/3532/0735/files/tawobu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0063/5290/files/7571032127.pdf
    • https://cdn.shopify.com/s/files/1/0432/2410/5121/files/79361165712.pdf
    • https://cdn.shopify.com/s/files/1/0436/9242/5384/files/telewimifisabumo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1641/files/numuvu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/pivur.pdf
    • https://cdn.shopify.com/s/files/1/0434/3005/2005/files/zudud.pdf
    • https://cdn.shopify.com/s/files/1/0429/7729/6543/files/19341081885.pdf
    • https://cdn.shopify.com/s/files/1/0434/4630/4920/files/xapesozipura.pdf
    • https://cdn.shopify.com/s/files/1/0437/8171/8173/files/35220511585.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/
    • https://cdn.shopify.com/s/files/1/0432/2410/5121/files/79361165712.pd

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063d9.bin
8fa895877365b37598d05e7ecdb89389ad75c3bf684f684e8996a8371f9795bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x63D9 5460 bytes
font_01_sfnt_off00007668.bin
26c65666500f6ae541034332689ca4000f44579d25be04249064ad27bf509bff
pdf-font-stream PDF embedded font (sfnt) at offset 0x7668 9540 bytes