Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7ed19a732964a3…

MALICIOUS

PDF

45.8 KB Created: 2020-08-05 14:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dba617ac7799eda0c679ce6c276280e7 SHA-1: 1c5069984f284a61f464f9fc46fdf124ff1584bf SHA-256: 9b7ed19a732964a34cfb5de4cf90ee38c84720c818ecc1683c8fc1153686d531
152 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains hosting PDF files, likely as part of an SEO link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=english+short+story+books+pdf+free+download'. The document body, though heavily obfuscated, contains this same URL, suggesting the primary intent is to redirect users to malicious content under the guise of a free book download. 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=english+short+story+books+pdf+free+download
    • http://files.ofallonhillssubdivision.org/uploads/1/3/1/1/131163780/bubivajirugufup.pdf
    • http://files.poetweaver.com/uploads/1/3/1/1/131164425/1308809.pdf
    • http://xufozo.kettlecoveicecream.com/uploads/1/3/1/6/131637316/dukorej-xuwirimododiwok-netozotane-werovur.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/mupupi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9377/8837/files/zejawefoxujitakavigorowe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mekokagowofulagifofid.pdf
    • https://cdn.shopify.com/s/files/1/0429/9112/4643/files/19217769490.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5704/files/saddle_club_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/3636/8296/files/67689606166.pdf
    • https://cdn.shopify.com/s/files/1/0431/6545/0389/files/pokemon_adventures_volume_1_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/1455/3763/files/69250483111.pdf
    • https://cdn.shopify.com/s/files/1/0435/7206/8520/files/active_voice_and_passive_voice_chart.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2857609843.pdf
    • https://cdn.shopify.com/s/files/1/0430/5597/2501/files/93703113136.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_off0000673e.bin
cd77e7d2fca9408ec4f04801880d3df61cc28b509b650017ff15c904cbcc9312		 pdf-font-stream PDF embedded font (sfnt) at offset 0x673E 5444 bytes
font_01_sfnt_off000079cd.bin
b691805992a94f9d2754efd136eab8a46d891665c02d5190d6813643713c2e2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79CD 10060 bytes
font_02_sfnt_off00009c46.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C46 4324 bytes

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