Malicious PDF — malware analysis report

Static analysis result for SHA-256 788f94a757c4081d…

MALICIOUS

PDF

41.7 KB Created: 2020-07-31 19:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55f83ff3682667047ac785838b868ed0 SHA-1: 5819b1f78110ac36664df0e305b3109768d4899e SHA-256: 788f94a757c4081de1bae302675b15963ad084ae156f8f125f4b0df19a1c5b9f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by a machine learning classifier and contains numerous embedded links. One of the primary links, 'https://ttraff.com/pify?keyword=nstm+631+pdf', points to known malicious redirector infrastructure, indicating an attempt to lead the user to harmful content. The document also features a large number of other PDF links, suggesting a link farm or a similar deceptive tactic.

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.com/pify?keyword=nstm+631+pdf
    • http://files.nidinidi.com/uploads/1/3/1/1/131163691/7347670.pdf
    • http://files.danielamonasteriostan.com/uploads/1/3/0/9/130969498/5946475.pdf
    • http://files.kellimahoney.com/uploads/1/3/1/6/131606231/leripezivumu.pdf
    • http://files.granvillecountyteencourt.com/uploads/1/3/2/6/132696604/kaligosi.pdf
    • http://files.courtneymillerpilates.com/uploads/1/3/0/9/130969624/81e9dc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1347/1384/files/71696253643.pdf
    • https://cdn.shopify.com/s/files/1/0431/7331/4715/files/xexopolusuk.pdf
    • https://cdn.shopify.com/s/files/1/0440/1093/0341/files/67466620055.pdf
    • https://cdn.shopify.com/s/files/1/0435/5378/3957/files/15942976251.pdf
    • https://cdn.shopify.com/s/files/1/0435/5765/0584/files/jomidezefiz.pdf
    • https://cdn.shopify.com/s/files/1/0434/2608/7064/files/82740536506.pdf
    • https://cdn.shopify.com/s/files/1/0428/9472/1187/files/29984193604.pdf
    • https://cdn.shopify.com/s/files/1/0436/7217/4745/files/11761599455.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4074/files/dobeteduv.pdf
    • https://cdn.shopify.com/s/files/1/0436/9340/8409/files/36983865510.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/gukawumunutonopep.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6269/files/zaxigavono.pdf
    • https://cdn.shopify.com/s/files/1/0435/2986/3323/files/73644620691.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006535.bin
8ed27caed624a22117ea4e24bbb95edfc117157e6a0b10e4dc7785dc43ab4eb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6535 5188 bytes
font_01_sfnt_off000076db.bin
7d5e99b2cc02dedf001de66f9582a019603a8ceb2d52c33ce77a30ffbe1e88e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76DB 10436 bytes

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