Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f629139f8341c4…

MALICIOUS

PDF

45.1 KB Created: 2020-08-08 00:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e26a0110e2bf1648ec2a99864ec12fd6 SHA-1: a0f207403bbf12f33f7c79029ba69e54bac6f08b SHA-256: 22f629139f8341c459bc1897756d7ec2c3506f0c515826a273bd18a879e63af2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of the primary links redirects to a known malicious redirector infrastructure at 'ttraff.ru'. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a malicious redirector and a link farm designed to distribute malicious content. The document body, though heavily obfuscated, contains the lure text 'Halloween bingo printable free pdf' and the malicious URL, reinforcing the phishing and redirection attack pattern.

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=halloween+bingo+printable+free+pdf
    • http://tajeveg.workbirding.com/uploads/1/3/0/7/130740013/nitifejamabavo.pdf
    • http://files.colliquecuffs.net/uploads/1/3/1/4/131483138/9278445.pdf
    • http://files.chrisball-student.com/uploads/1/3/1/3/131383802/vemite.pdf
    • http://files.ordanburdaninfo.com/uploads/1/3/2/6/132696104/kuferedeg.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0767/files/dotefejumipofagasil.pdf
    • https://cdn.shopify.com/s/files/1/0432/2725/0850/files/volobuvugase.pdf
    • https://cdn.shopify.com/s/files/1/0431/3835/1255/files/ralagareliluwa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6404/1365/files/reading_books_benefits.pdf
    • https://cdn.shopify.com/s/files/1/0437/1467/4841/files/iso_to_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0431/1711/7589/files/castor_beans_farming.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78491346320.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/kubanesuwele.pdf
    • https://cdn.shopify.com/s/files/1/0427/6604/1244/files/fogigenuna.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7507/files/29561144074.pdf
    • https://cdn.shopify.com/s/files/1/0433/5609/4615/files/the_playbook_online.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61047377128.pdf
    • https://cdn.shopify.com/s/files/1/0429/8198/2361/files/lefabujuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/581871399.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_off000071d9.bin
e47cacdddf4ade56ca68a012e09ff080a6a92405db342f91890cc1482b466a71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71D9 5224 bytes
font_01_sfnt_off000083bd.bin
3796477b2dd3289dc9d0e0c2673e7c9b1de5aa7509c56fb2e7c4e2364d551e13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83BD 10292 bytes

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