Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b450d4d5737046a…

MALICIOUS

PDF

36.0 KB Created: 2020-08-31 02:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b58f75ab116015db88d2c004eb378c03 SHA-1: 244546c77973cca35e17f920d36d191bf6bf72cc SHA-256: 5b450d4d5737046a4c6aea4300ffd80d9ffa94b988d73baa21d849704a27e4d3
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to SEO-optimized PDF files hosted on Shopify. One of the primary links directs to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to the malicious URL and appears to be a lure for adult content, likely to mask a more malicious intent. No scripts were extracted, but the presence of numerous links suggests an attempt to drive traffic to malicious sites.

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.com/wix?keyword=kimmy+granger+lesbian+porn
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/8019/4975/files/king_s_raid_clause_transcendence_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/4059/5352/files/94065484152.pdf
    • https://cdn.shopify.com/s/files/1/0428/5156/5724/files/96638610550.pdf
    • https://static.usrfiles.com/ugd/b8c837_8c0452be10fc494bbbe4d85771ffaf5d.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1255/files/losimoxazavuxisesixosud.pdf
    • https://cdn.shopify.com/s/files/1/0434/7346/9597/files/strategic_marketing_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0086/files/71148674084.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/55781022724.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1796/files/nazinaponibewi.pdf
    • https://cdn.shopify.com/s/files/1/0452/1410/5760/files/70484003700.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0810/files/31146491086.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_off000042aa.bin
6169e31ddc8f9b92c38680509649e1ed7bcce825ef6c2693a53daacfc8f64409
pdf-font-stream PDF embedded font (sfnt) at offset 0x42AA 5060 bytes
font_01_sfnt_off000053b3.bin
796499c889ef0f141197ad1991759947e2986275c8d4a1da76e4685d9c7e18be
pdf-font-stream PDF embedded font (sfnt) at offset 0x53B3 9900 bytes
font_02_sfnt_off0000757a.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x757A 4324 bytes