Malicious PDF — malware analysis report

Static analysis result for SHA-256 d363859232f8ad43…

MALICIOUS

PDF

56.8 KB Created: 2020-08-12 22:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7ef2b986fac2669775687071267abf1 SHA-1: a11f065f75f45d91cc9cfb85367c3f58021487a6 SHA-256: d363859232f8ad43b518c629d01077b4038e421f5d132fbf1fc2569de1cd9d36
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, forming a link farm. One of these links, https://ttraff.cc/pify?keyword=wordly+wise+3000+book+8+lesson+16+pdf, points to a known malicious redirector. The presence of numerous links to other PDFs, many hosted on Shopify, suggests a tactic to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness.

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=wordly+wise+3000+book+8+lesson+16+pdf
    • http://files.dcalfine.com/uploads/1/3/1/3/131383763/zobub.pdf
    • http://mawofi.edwardschapel.org/uploads/1/3/2/6/132681670/gizudejuvuwiri.pdf
    • http://jedowe.allisonburgessbrandt.com/uploads/1/3/1/8/131856372/tolidom-rubasugug-femilun.pdf
    • https://cdn.shopify.com/s/files/1/0428/4186/6403/files/jopoxijeluxivarok.pdf
    • https://cdn.shopify.com/s/files/1/0437/6399/0686/files/barclays_bank_statement_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/8145/6023/files/79786349328.pdf
    • https://cdn.shopify.com/s/files/1/0437/2961/7057/files/wozejax.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/ririsosedetaratifala.pdf
    • https://cdn.shopify.com/s/files/1/0433/0255/1716/files/sofex.pdf
    • https://cdn.shopify.com/s/files/1/0432/3727/7855/files/furupowa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2963/4970/files/16324260827.pdf
    • https://cdn.shopify.com/s/files/1/0432/5477/5970/files/42824836479.pdf
    • https://cdn.shopify.com/s/files/1/0429/5150/8131/files/before_i_fall_script.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_off00009f14.bin
946d7f7ba5ec3982e3586dff4d799decae5a129e73185da7f9461e81ac295e71
pdf-font-stream PDF embedded font (sfnt) at offset 0x9F14 5940 bytes
font_01_sfnt_off0000b383.bin
81a1c89e692ebec7a2cc9ff7018ef3de3233add3a0bad4d4c78e886d3526dc10
pdf-font-stream PDF embedded font (sfnt) at offset 0xB383 10240 bytes