Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f42e6912398794…

MALICIOUS

PDF

44.8 KB Created: 2020-08-09 12:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f764d11394e058455906d6beb7a4af89 SHA-1: 16b584ca2f3b3677c085de1f4e3534aaaac1801d SHA-256: a3f42e69123987941498522cc39c97da5792e3b299199d86ef205af1fb7a9871
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external files, many hosted on Shopify. The primary malicious URL identified is https://ttraff.cc/pify?keyword=neurobiology+of+mental+disorders+pdf, which likely serves as a lure to download further malware or redirect to phishing content. The document body, though heavily obfuscated, contains this URL and others.

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=neurobiology+of+mental+disorders+pdf
    • http://files.streetambitionunited.com/uploads/1/3/1/3/131379115/jivemalegotojazuja.pdf
    • http://files.thechelseafunnery.com/uploads/1/3/1/4/131437064/8884029.pdf
    • http://dubip.iniic.com/uploads/1/3/0/8/130874067/badolev_ritubeviw_jagisunazezi_kenotakubanokej.pdf
    • http://files.dlogiceu.com/uploads/1/3/1/4/131437376/vodozaxufu-vesurasud.pdf
    • http://files.joffemillwork.com/uploads/1/3/0/7/130739754/wikovuvadibut.pdf
    • https://cdn.shopify.com/s/files/1/0432/3426/3199/files/novel_best_seller_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2125/files/66776787436.pdf
    • https://cdn.shopify.com/s/files/1/0431/6889/1040/files/babuvug.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/forimiwuzibinujorinodu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/loxidunadubufurepetiverox.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1587610690.pdf
    • https://cdn.shopify.com/s/files/1/0428/2620/3302/files/90562899505.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/kotisuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42228357160.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_off000071bd.bin
9c693df7cce259728f351e4e89b4d5a15cca6f38761f97be629569f80cdae78b
pdf-font-stream PDF embedded font (sfnt) at offset 0x71BD 5572 bytes
font_01_sfnt_off000084a4.bin
2165315719a5427531cbfe4d05d16b00cbfeb19f64442a5216c181e66ac5f523
pdf-font-stream PDF embedded font (sfnt) at offset 0x84A4 9820 bytes