Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f505b4551bd75cd…

MALICIOUS

PDF

45.2 KB Created: 2020-08-25 10:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3258bf0aacab11d221dffc334310c656 SHA-1: a92e73ffdb4855f232efc3fbed37a07e3ffc26d2 SHA-256: 9f505b4551bd75cd08a268fe7287241ff6a6769a5157ef20a9cdb85eca0f628c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a crossword puzzle answer. The PDF also hosts a large number of external links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly indicated maliciousness. The primary attack vector appears to be social engineering via a deceptive document.

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=food+thickener+crossword+answer
    • http://files.mustangexpediting.com/uploads/1/3/1/4/131406498/1b2dbd76.pdf
    • http://feluforov.jammiemelgar.com/uploads/1/3/0/7/130738511/tagijekodezo.pdf
    • http://rikifemu.dublinsolicitorscpd.com/uploads/1/3/0/9/130969916/vofegenazowoper.pdf
    • https://cdn.shopify.com/s/files/1/0434/3024/8600/files/21478861483.pdf
    • https://cdn.shopify.com/s/files/1/0435/6666/1800/files/rogudif.pdf
    • https://cdn.shopify.com/s/files/1/0428/0382/2755/files/antrenmanlarla_matematik_1_soru_bankas.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fenajowogotuxukat.pdf
    • https://cdn.shopify.com/s/files/1/0435/0532/0088/files/gitivad.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5221/files/ccdc_22.pdf
    • https://cdn.shopify.com/s/files/1/0428/4229/2390/files/41120264242.pdf
    • https://cdn.shopify.com/s/files/1/0434/3411/5233/files/77959017206.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/73827302753.pdf
    • https://cdn.shopify.com/s/files/1/0433/2004/9822/files/acetilcolina_funcion.pdf
    • https://cdn.shopify.com/s/files/1/0437/7713/0658/files/missing_you_piano_sheet_music_btob.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/2007_dodge_caliber_manual.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_off000072ba.bin
45b89ed3a06c7718b57d21e788b0b81b4b4259b5529021e2867d2b82ad0bd904
pdf-font-stream PDF embedded font (sfnt) at offset 0x72BA 5108 bytes
font_01_sfnt_off0000841f.bin
97a3d1f728d37f83876d4d2867419062798746f0e605b1f476e066ffd1acd3d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x841F 10340 bytes