Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf24d9e0bf116dc…

MALICIOUS

PDF

44.3 KB Created: 2020-08-05 02:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6e28d6d24e795023b152d3838d78f49 SHA-1: 0928eb0ad5188059c3ae9575c726bf3a7f417586 SHA-256: 1cf24d9e0bf116dc797dd39d8ee371238feb41d79866b01b097b0103f7e3e0d2
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated but contains the same URL as the malicious redirector, suggesting the primary goal is to drive traffic to this malicious site, likely for phishing or malware distribution.

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.cc/pify?keyword=stability+of+cycloalkanes+pdf
    • http://files.sightseeing-copenhagen.com/uploads/1/3/2/6/132695575/mufemig.pdf
    • http://files.boydsbaseball.com/uploads/1/3/0/7/130776037/50b18a62205.pdf
    • http://files.sunnyandsavvyrootsco.com/uploads/1/3/0/9/130969200/fukodidogeka.pdf
    • http://files.biophysical-ecology.com/uploads/1/3/1/4/131406356/xivut_girusidusowele_finusagon.pdf
    • http://files.c3horsemanship.com/uploads/1/3/0/7/130775084/ritudu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/wacom_intuos_3_pen.pdf
    • https://cdn.shopify.com/s/files/1/0433/8542/1978/files/3752800501.pdf
    • https://cdn.shopify.com/s/files/1/0430/4083/3690/files/15391131888.pdf
    • https://cdn.shopify.com/s/files/1/0430/2385/9873/files/zekokukago.pdf
    • https://cdn.shopify.com/s/files/1/0431/4421/6727/files/sowagadifogameworisokegog.pdf
    • https://cdn.shopify.com/s/files/1/0432/9888/1704/files/868855510.pdf
    • https://cdn.shopify.com/s/files/1/0433/4783/7083/files/86587269505.pdf
    • https://cdn.shopify.com/s/files/1/0437/9394/0641/files/vadap.pdf
    • https://cdn.shopify.com/s/files/1/0432/8708/5220/files/asics_gel_resolution_6_womens_tennis_shoe.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/69098015912.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/89104995056.pdf
    • https://cdn.shopify.com/s/files/1/0427/8219/5879/files/24736283613.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5774/files/16435119179.pdf
    • https://cdn.shopify.com/s/files/1/0430/9309/8660/files/nevigonewomusor.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_off00006dfa.bin
416c1cf13b7a790b943c2553fa2a8dde05f1e63393bae5a747a25c1a4ef5abed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DFA 5464 bytes
font_01_sfnt_off000080ac.bin
383d0d1687680cfbbdfe451086ec335f8a6a865d5a96a93ce9e834c73c0e7e8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80AC 10820 bytes

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