Malicious PDF — malware analysis report

Static analysis result for SHA-256 159775c9950ba675…

MALICIOUS

PDF

35.0 KB Created: 2020-08-22 22:39:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf34a775dbd02bf94a1d6dc5506a131b SHA-1: ff5b0db31d62ae2352d13051a3a91bae2bfa7c34 SHA-256: 159775c9950ba6753efc38dd892aa4279a6eda194866352ccb3bfd67d748bec5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a malicious redirector link disguised as a game ROM download, which leads to a farm of other PDF files. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a link-farming or redirection scheme. No scripts were extracted, but the embedded malicious URL is the primary indicator of compromise.

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=bomberman+hero+rom
    • http://files.omprakashsingh.com/uploads/1/3/0/9/130969048/ea0ee81.pdf
    • http://files.mothers-for-mothers.com/uploads/1/3/2/7/132712011/vubunujaduj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/5670/9288/files/railroad_tycoon_2_strategy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/8220/3801/files/chiari_malformation_type_1_measurements.pdf
    • https://cdn.shopify.com/s/files/1/0430/9218/1153/files/67041511218.pdf
    • https://cdn.shopify.com/s/files/1/0429/2814/4543/files/44824464181.pdf
    • https://cdn.shopify.com/s/files/1/0438/6373/6485/files/jenugobumipafapev.pdf
    • https://cdn.shopify.com/s/files/1/0429/3646/7623/files/trigger_points_chart.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/poxusulijupidokubeb.pdf
    • https://cdn.shopify.com/s/files/1/0447/1400/0538/files/someone_to_trust_mary_balogh.pdf
    • https://cdn.shopify.com/s/files/1/0447/9621/5456/files/page_break_in_jspdf.pdf
    • https://cdn.shopify.com/s/files/1/0430/9454/0439/files/chemistry_syllabus.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_off000041ef.bin
f06e4baeff3e220ab1b84fe9bcbff301a70c3d32f383a1a5022790061e538a63
pdf-font-stream PDF embedded font (sfnt) at offset 0x41EF 4564 bytes
font_01_sfnt_off00005119.bin
5697c8d4f2138885eb2d5a48ec48fc1152a5ac47f69bae0a0a7b4c6fbf67d902
pdf-font-stream PDF embedded font (sfnt) at offset 0x5119 9588 bytes
font_02_sfnt_off00007179.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7179 4324 bytes