Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e9bdf09149920f7…

MALICIOUS

PDF

36.8 KB Created: 2020-08-14 16:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16c08d43435f057180affe35550b0cf2 SHA-1: febe0d2a2fcbf3726c57e20454ad886d1d7dda9d SHA-256: 0e9bdf09149920f759caee3167c101f8090ef24e3430d032812397bc1e470933
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to external resources, which is indicative of a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting an attempt to lead the user to a harmful site. 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.com/pify?keyword=certificate+of+conformity+light+novel
    • http://files.gatsbybandflorida.com/uploads/1/3/1/6/131637302/mobeguximore.pdf
    • http://files.abovethecoals.com/uploads/1/3/1/8/131856706/tapiboronirewub-wakusali-xawemonerurumij-lanujaka.pdf
    • http://korivu.nqnd.org/uploads/1/3/1/4/131406062/6257284.pdf
    • http://files.stcroixtech.org/uploads/1/3/1/3/131380354/6879374.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3313/2184/files/jisaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/1561/9239/files/lomeverusifuxufo.pdf
    • https://cdn.shopify.com/s/files/1/0440/8947/5237/files/90140481650.pdf
    • https://cdn.shopify.com/s/files/1/0433/4744/3865/files/what_is_bravais_lattice.pdf
    • https://cdn.shopify.com/s/files/1/0437/9816/7713/files/google_sheets_merge_cells.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/53148004507.pdf
    • https://cdn.shopify.com/s/files/1/0433/2814/3510/files/33613218854.pdf
    • https://cdn.shopify.com/s/files/1/0430/0505/1029/files/76654269857.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_off00005202.bin
d41168eddd3c45eba2340a1903fa3f98e2419d96a83c694c2a299e4288a029c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5202 5184 bytes
font_01_sfnt_off00006387.bin
0b5e56ac3be549fbd56129f5af5e8c6f74e850541a245afe7a2938239913084d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6387 10376 bytes