Malicious PDF — malware analysis report

Static analysis result for SHA-256 6897349bd873c845…

MALICIOUS

PDF

44.5 KB Created: 2020-08-23 07:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16e2ec16fd0ca37943dc6be12acb6eee SHA-1: d7426a0baa31179533e541b047333a5f2d78426d SHA-256: 6897349bd873c8455bb5cf594c2544e7d9f7207e080376f873c012407f2c0626
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link disguised as a 'loach care guide' that redirects to malicious infrastructure. It also features a large number of links to other PDFs, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL is a high-confidence indicator of malicious intent.

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=loach+care+guide
    • http://files.kastedu.org/uploads/1/3/1/6/131606815/9ed75.pdf
    • http://xetikov.centraliahsbands.org/uploads/1/3/1/4/131453698/5824731.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/1478/1088/files/the_effortless_experience_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0924/4316/files/11796688013.pdf
    • https://cdn.shopify.com/s/files/1/0440/6145/8582/files/bidafogez.pdf
    • https://cdn.shopify.com/s/files/1/0432/6499/9588/files/914_222_5121.pdf
    • https://cdn.shopify.com/s/files/1/0430/7386/3842/files/vietnamese_food_guide.pdf
    • https://cdn.shopify.com/s/files/1/0440/8151/2613/files/16729857698.pdf
    • https://cdn.shopify.com/s/files/1/0438/2051/5488/files/fijevegezikiwoniwoxe.pdf
    • https://cdn.shopify.com/s/files/1/0452/0011/3813/files/azar_basic_english_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0431/4457/7178/files/86507995843.pdf
    • https://cdn.shopify.com/s/files/1/0436/6349/1222/files/bokogoxurofaralozuleko.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006464.bin
34ac1510ec19661bf7bbbd724f2682ebc74b2d9ca57b161dfd5aa89db81ae0ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x6464 4628 bytes
font_01_sfnt_off00007428.bin
13853b75220881af47b279797b9bd010fb0e6020a1f73e7460e4cb944a2991a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7428 10308 bytes
font_02_sfnt_off00009769.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x9769 4324 bytes