Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e508fc4c453810…

MALICIOUS

PDF

73.2 KB Created: 2020-07-24 10:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e54d6f248d2195b79be18f3dfd197b68 SHA-1: ad5caf243f29f11a2b81e3ac494eed9d4aadbbc4 SHA-256: b1e508fc4c453810123afefcb392a46cbd6e22e8a4b0874b50c6756f2a418423
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that points to traff.cc, a known malicious domain. It also features a large number of external PDF links, many hosted on Shopify, likely as part of an SEO link farm to improve search engine ranking for the malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure itself is suspicious due to duplicate object bodies.

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/wb?keyword=unlimited%20power%20in%20urdu%20pdf%20download
    • http://files.ferretsandfriends.org/uploads/1/3/2/8/132814146/wagata.pdf
    • http://files.memorylanebnb.com/uploads/1/3/1/6/131606125/3635187.pdf
    • http://files.josie-johnson.com/uploads/1/3/1/6/131606674/tazenagamol-guzixadakufe-juwixuzeno.pdf
    • http://files.wrbtrailway.com/uploads/1/3/1/3/131382491/vitojonakegu-woful-rerapeve-dujivowuluzipum.pdf
    • https://cdn.shopify.com/s/files/1/0428/7938/5766/files/nalubagug.pdf
    • https://cdn.shopify.com/s/files/1/0432/2902/0317/files/76471898826.pdf
    • https://cdn.shopify.com/s/files/1/0428/8921/6167/files/43801811995.pdf
    • https://cdn.shopify.com/s/files/1/0431/2537/5130/files/mexenesezifup.pdf
    • https://cdn.shopify.com/s/files/1/0434/5063/0296/files/zojijenepilifilola.pdf
    • https://cdn.shopify.com/s/files/1/0430/3480/4375/files/98403829388.pdf
    • https://cdn.shopify.com/s/files/1/0431/0922/0501/files/kafimojodogosuzumokuji.pdf
    • https://cdn.shopify.com/s/files/1/0440/6411/2805/files/daximaxu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7738/6911/files/89919721985.pdf
    • https://cdn.shopify.com/s/files/1/0433/9613/7111/files/pimonepid.pdf
    • https://cdn.shopify.com/s/files/1/0429/5540/7511/files/78390509936.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/67408285059.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_off0000e358.bin
11be394bb24c08654b633dfdb8d59ee6279d130b1e3ea3742e5b0dc55a2f0a6f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE358 4972 bytes
font_01_sfnt_off0000f42e.bin
95b6306c6bf283217bf2d25e9ebc987912b932a16264b26ba9c5000c265b35a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF42E 10300 bytes