Malicious PDF — malware analysis report

Static analysis result for SHA-256 991efe91dba75779…

MALICIOUS

PDF

44.4 KB Created: 2020-08-27 13:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebac6ee26fea9da3f31bf1dcae3ba601 SHA-1: e45afc59f7706b27ede45a2f0ae963fcdfee4499 SHA-256: 991efe91dba757798f2d58c158eac8f5d5f12483100f8a44d40350f664afed7f
154 Risk Score

Malware Insights

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

The PDF contains a lure related to 'Adobe cs6 master collection serial number mac' and embeds a link that redirects to 'https://ttraff.ru/pify?keyword=adobe+cs6+master+collection+serial+number+mac'. This redirector is flagged as malicious. Additionally, the PDF includes a large number of links to Shopify-hosted PDFs, suggesting a link farm for SEO poisoning or traffic generation. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=adobe+cs6+master+collection+serial+number+mac
    • http://wesesizi.mendedhearts117.org/uploads/1/3/2/6/132681670/pivobo_wogunema_sejituwulesofez_xigasilof.pdf
    • http://kekutaba.spotlighteditorial.com/uploads/1/3/0/7/130775840/68a76a5f30606.pdf
    • https://cdn.shopify.com/s/files/1/0430/0292/1123/files/siwosasafip.pdf
    • https://cdn.shopify.com/s/files/1/0431/6836/6746/files/nokosarelupadu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9703/0817/files/52345575040.pdf
    • https://cdn.shopify.com/s/files/1/0429/7143/1065/files/3861474507.pdf
    • https://cdn.shopify.com/s/files/1/0435/5738/8437/files/adjective_adverb_and_noun_clauses.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0840/files/talafoxusawixenubo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7193/0529/files/bancassurance_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/2752/8861/files/labaxepasisi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5294/9913/files/zefilawijarisetavefe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1460/files/32954222342.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_off00006619.bin
a680180934e66559b58af017d68f5db1725016268085d3ea47d48106382d1b65
pdf-font-stream PDF embedded font (sfnt) at offset 0x6619 5368 bytes
font_01_sfnt_off00007830.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7830 1800 bytes
font_02_sfnt_off000080be.bin
956b35528f4abf4cf66553afca814047405d3728e555be2a0b9dc7796daae433
pdf-font-stream PDF embedded font (sfnt) at offset 0x80BE 10464 bytes