Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1988a8699b0fba…

MALICIOUS

PDF

40.7 KB Created: 2020-08-15 22:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dae392bb450f7864f54056c369704be3 SHA-1: 639ac49b1107db8492a2337242f138ed6c6635ac SHA-256: ad1988a8699b0fbaf7c76728bc1e39aed4a000cb65e547564d3b9e55f6263cfd
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at `https://ttraff.ru/wb?keyword=blood%20guts%20and%20glory%20pdf`. This suggests a link farm or SEO poisoning tactic designed to lure users to malicious infrastructure. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector is a strong indicator of malicious intent.

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.ru/wb?keyword=blood%20guts%20and%20glory%20pdf
    • http://files.foreverflyskate.com/uploads/1/3/0/7/130776781/6cee7.pdf
    • http://kotolope.midwestbooksellers.org/uploads/1/3/1/4/131438379/gejomivatulepa.pdf
    • http://files.beingbryan.com/uploads/1/3/0/7/130776246/tusafifemiwojif-fuxikoged-zilowugijekipi-nixemig.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12509012650.pdf
    • https://cdn.shopify.com/s/files/1/0430/4545/3985/files/4718593958.pdf
    • https://cdn.shopify.com/s/files/1/0435/1731/3178/files/bikekubinilusetozapekap.pdf
    • https://cdn.shopify.com/s/files/1/0434/4145/5254/files/58740938239.pdf
    • https://cdn.shopify.com/s/files/1/0430/6396/7906/files/29715250176.pdf
    • https://cdn.shopify.com/s/files/1/0432/7496/1059/files/forensic_accounting_journal.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1825/files/witabirijakili.pdf
    • https://cdn.shopify.com/s/files/1/0434/0131/4454/files/25684995742.pdf
    • https://cdn.shopify.com/s/files/1/0428/5235/2159/files/wakilexo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9495/7475/files/98474781742.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000484e.bin
fc1d1e82efcfb7c6a62887fbd13e153a5e1a6905e9019e892b8e0cac457f9c51
pdf-font-stream PDF embedded font (sfnt) at offset 0x484E 5076 bytes
font_01_sfnt_off000059a5.bin
f5adaf239c559171116a2afa41ffc7ad85649636e7c93a2c6ee62fd379146eef
pdf-font-stream PDF embedded font (sfnt) at offset 0x59A5 14208 bytes
font_02_sfnt_off00008602.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8602 4324 bytes