Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f2aa685964d7dc…

MALICIOUS

PDF

40.8 KB Created: 2020-08-09 22:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 896dcffbdf66e3ae6a4e9fb92b61fcd7 SHA-1: 33194e3eb2c013a37fbb323d110e082a424d6063 SHA-256: 70f2aa685964d7dcb670ff732c7fd0a53aaa39c0e345bce6b9ad6fa16fddd5e4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to external PDF files, which is indicative of a link farm or SEO manipulation tactic. One of the primary links directs to a known malicious redirector, suggesting an attempt to lead the user to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=all+antibiotics+list+pdf
    • http://files.skycruiseandtravel.com/uploads/1/3/1/4/131452935/f80721456c58c7.pdf
    • http://files.pamelaarmstronggallery.com/uploads/1/3/0/7/130776599/tisuwagimiwoxesuzaf.pdf
    • http://files.prebleswcd.org/uploads/1/3/1/4/131454521/numepivenuwurij.pdf
    • http://files.libertyppg.com/uploads/1/3/1/4/131483254/019a948118f68.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/7963/9967/files/vomuvuxubikifubepagopob.pdf
    • https://cdn.shopify.com/s/files/1/0431/6135/4389/files/32716139715.pdf
    • https://cdn.shopify.com/s/files/1/0440/5939/4213/files/lulezoledo.pdf
    • https://cdn.shopify.com/s/files/1/0435/4303/6053/files/butcher_s_crossing.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8152/files/36771207268.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1064/files/61406012472.pdf
    • https://cdn.shopify.com/s/files/1/0429/6497/5765/files/nogabuwafikonaxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0138/files/24666363944.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/makokesubiniv.pdf
    • https://cdn.shopify.com/s/files/1/0433/2768/4760/files/27400948356.pdf
    • https://cdn.shopify.com/s/files/1/0438/8998/3643/files/how_to_set_time_on_ihome.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66923604261.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006296.bin
e071037e56f7c1739564924503056625a0e44ae7f0d50b5d68883c55468bcf90
pdf-font-stream PDF embedded font (sfnt) at offset 0x6296 5184 bytes
font_01_sfnt_off00007449.bin
0d694bbf5916900c81230e4cc13f079b33356c207128d680f7e6647155ef1276
pdf-font-stream PDF embedded font (sfnt) at offset 0x7449 9980 bytes