Malicious PDF — malware analysis report

Static analysis result for SHA-256 83714bc9ab5d408b…

MALICIOUS

PDF

45.2 KB Created: 2020-08-14 12:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b938959554860c1df0edeaec94ffba5 SHA-1: f36d0b293d8410678c753b0495fbd01b5780f8c9 SHA-256: 83714bc9ab5d408b06622d8fbb02ec66659a609556e9e314af730c5e77bc4b8b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a large number of embedded links, many of which point to link farms and redirector infrastructure. One critical heuristic identified a link to known malicious redirector infrastructure, and another identified the document as an advance-fee scam lure. The presence of numerous PDF links suggests an attempt to distribute malicious content or engage in SEO manipulation for phishing purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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=sample+accomplishment+report+of+master+teacher
    • http://files.alyssaaleksanian.com/uploads/1/3/1/4/131406749/vuvigowalaxifu-jowigulipusel-pozeniteboki.pdf
    • http://files.valleyfarm.ca/uploads/1/3/0/9/130970003/a09c7a07.pdf
    • http://files.shortsalesuccessna.com/uploads/1/3/1/3/131379761/pigopaf.pdf
    • http://juxijex.travelinteach.com/uploads/1/3/0/7/130739415/2070149.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6878/3768/files/fat_tire_bike_buying_guide.pdf
    • https://cdn.shopify.com/s/files/1/0436/0539/3570/files/86901293279.pdf
    • https://cdn.shopify.com/s/files/1/0433/7179/0494/files/61248789461.pdf
    • https://cdn.shopify.com/s/files/1/0430/6305/0394/files/74079186987.pdf
    • https://cdn.shopify.com/s/files/1/0430/6678/5949/files/pivetugidigatam.pdf
    • https://cdn.shopify.com/s/files/1/0431/6879/2733/files/57527065925.pdf
    • https://cdn.shopify.com/s/files/1/0431/5090/1402/files/81101153462.pdf
    • https://cdn.shopify.com/s/files/1/0437/2794/5889/files/dsp_first_mcclellan.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8080/files/pedunezuzelavinosove.pdf
    • https://cdn.shopify.com/s/files/1/0455/6567/3637/files/mitsubishi_air_conditioner_remote_control_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/5208/1053/files/el_barril_del_amontillado.pdf
    • https://cdn.shopify.com/s/files/1/0436/6453/9798/files/vukijun.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065cd.bin
c80b935bb2e72fbf0bb54bead4dcf673e2ee9ff5a06d35ab91e29c0786333a85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65CD 1696 bytes
font_01_sfnt_off00006df7.bin
738b2b91cbf849487ee6bfc4a17b29fd4010e82d8a5b14fd1748930ee609c174		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF7 5356 bytes
font_02_sfnt_off00007fff.bin
f86fb43df971d3970d190a14218f8baed006dc9cf1d810a28d7f4b9b2b3ed50e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FFF 12284 bytes

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