Malicious PDF — malware analysis report

Static analysis result for SHA-256 18256549dfb8650f…

MALICIOUS

PDF

53.2 KB Created: 2020-08-19 23:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00f0b6859e72460f97bc458233fe390d SHA-1: 8223542d9c068d29d4778a78060cc43e1f00c45a SHA-256: 18256549dfb8650f9ea462f2ea7e966b4f1a7bf58e55843ea9ede45c2bc0a367
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a direct link to a known malicious redirector, disguised as an employment discrimination form. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests an attempt to drive traffic to malicious infrastructure. No scripts were extracted, but the document body and heuristics point to a phishing or redirection attempt.

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=va+complaint+of+employment+discrimination+form
    • http://zonimo.ptsocietytamu.com/uploads/1/3/2/6/132682052/vasesufodajodolo.pdf
    • http://files.handsupoutofpoverty.com/uploads/1/3/1/4/131452929/kopuxi.pdf
    • http://files.doramalech.net/uploads/1/3/0/8/130873949/a3118019.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5735/6710/files/bajaj_allianz_general_insurance_form.pdf
    • https://cdn.shopify.com/s/files/1/0447/2363/4330/files/speaking_english_like_an_american.pdf
    • https://cdn.shopify.com/s/files/1/0428/1748/7011/files/17221802947.pdf
    • https://cdn.shopify.com/s/files/1/0433/6402/4470/files/45571037624.pdf
    • https://cdn.shopify.com/s/files/1/0429/2496/6044/files/2917845753.pdf
    • https://cdn.shopify.com/s/files/1/0435/9880/7202/files/sevigilitabatogawifupasud.pdf
    • https://cdn.shopify.com/s/files/1/0437/6923/3557/files/57200279449.pdf
    • https://cdn.shopify.com/s/files/1/0432/6401/6539/files/45288908284.pdf
    • https://cdn.shopify.com/s/files/1/0436/6332/7385/files/53015871926.pdf
    • https://cdn.shopify.com/s/files/1/0428/3564/0487/files/71640503967.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/convert_f_to_c.pdf
    • https://cdn.shopify.com/s/files/1/0437/3282/8314/files/hitman_contracts_walkthrought.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_off0000920f.bin
f8c98ddf0cea081c97a65dcf802efa55633183c5eef486ab5f49b5b5d5f25a49
pdf-font-stream PDF embedded font (sfnt) at offset 0x920F 5368 bytes
font_01_sfnt_off0000a445.bin
ed6a2af5acd8e6cd5d806fc472504a5e34e037871f42ada6e1150ab2b3604d8d
pdf-font-stream PDF embedded font (sfnt) at offset 0xA445 10472 bytes