Malicious PDF — malware analysis report

Static analysis result for SHA-256 892ae998d310b536…

MALICIOUS

PDF

49.2 KB Created: 2020-08-11 23:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9a1a4201cc21ba8882341afa38c4f44 SHA-1: 4162c566eed421a441e296cc245078c607250a48 SHA-256: 892ae998d310b536837b560ce10a9fcc13bc38809d25f6eb2b91c718439a3918
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to domains associated with link farms and redirectors, indicating a phishing or malicious redirection attempt. The primary malicious URL identified is https://ttraff.ru/pify?keyword=place+a+gif+in+a+pdf, which is flagged as a known malicious redirector. The document body itself is heavily obfuscated and contains what appears to be junk data along with some URLs, further supporting the malicious intent of redirecting users to external sites.

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=place+a+gif+in+a+pdf
    • http://files.americaninspections.us/uploads/1/3/1/4/131482887/jaratelapolasizi.pdf
    • http://pukoxo.cymrumonochrome.com/uploads/1/3/2/6/132682883/lofibi_vudez.pdf
    • http://files.yorkhomebrewers.org/uploads/1/3/1/3/131384660/widoxebiposu.pdf
    • http://files.westernwilcodemsclub.com/uploads/1/3/1/0/131070452/e2180cb5.pdf
    • https://cdn.shopify.com/s/files/1/0436/1568/2717/files/what_does_lmao_stand_for.pdf
    • https://cdn.shopify.com/s/files/1/0432/6473/7448/files/9093267553.pdf
    • https://cdn.shopify.com/s/files/1/0437/4714/7928/files/tuvofubejivip.pdf
    • https://cdn.shopify.com/s/files/1/0431/0879/4530/files/78170082607.pdf
    • https://cdn.shopify.com/s/files/1/0429/0910/6332/files/fidabawa.pdf
    • https://cdn.shopify.com/s/files/1/0430/8133/4933/files/xezifikaxugupewu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/zelirolimokojogoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/3529/5905/files/97516234689.pdf
    • https://cdn.shopify.com/s/files/1/0438/4591/0678/files/kupawofupek.pdf
    • https://cdn.shopify.com/s/files/1/0439/2475/0504/files/13634662389.pdf
    • https://cdn.shopify.com/s/files/1/0433/5396/4712/files/46901479411.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_off000079a6.bin
588d68de0bfb8f6ac5e1f9902c697ec3b77a54cfe78d65bd1f41317683743d37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79A6 5048 bytes
font_01_sfnt_off00008adb.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ADB 1800 bytes
font_02_sfnt_off00009369.bin
a55c28087effa19c220d25e0d6c6a4979dba4acafc0b8cc9fdc6611b2abf4bdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9369 10564 bytes

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