Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bfac041e0987644…

MALICIOUS

PDF

60.3 KB Created: 2020-08-10 03:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33818ed0682d2fd49288d31d9473f539 SHA-1: 6cd2fb01b321a4570e511c10462074cda6d47be8 SHA-256: 4bfac041e09876446ada30bd7c43e9fcb70ecf2cde61af71615c0b44bf881cfb
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to the URLs, suggesting a link farm or SEO poisoning tactic to drive traffic to malicious sites. No scripts were extracted from this sample.

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=aspen+plus+getting+started+pdf
    • http://files.ahacentre.ca/uploads/1/3/1/4/131453527/3564ab47e0aa29.pdf
    • http://kuzez.onemindspiritualservices.com/uploads/1/3/2/7/132741334/tasakabokodemo-bizusugeve.pdf
    • http://files.kbsakirksville.com/uploads/1/3/2/7/132740399/sudelure.pdf
    • http://files.kalaikoodam.org/uploads/1/3/1/4/131453982/wabedepatugofo-tutin-godagimi-simoxamoju.pdf
    • http://files.shakespeare-garden.com/uploads/1/3/0/7/130738710/e4de2b84c6.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/takuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/1320/9246/files/99133810821.pdf
    • https://cdn.shopify.com/s/files/1/0438/7019/1771/files/mazunisedokegonumuruwifi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6985/7176/files/dogogekar.pdf
    • https://cdn.shopify.com/s/files/1/0432/1958/3133/files/82649759783.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/samavagumamefoger.pdf
    • https://cdn.shopify.com/s/files/1/0436/3943/9510/files/french_to_english_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/5397/2630/files/42914873071.pdf
    • https://cdn.shopify.com/s/files/1/0430/4368/4503/files/67052002412.pdf
    • https://cdn.shopify.com/s/files/1/0435/4103/7208/files/valuation_orthographe_ce2.pdf
    • https://cdn.shopify.com/s/files/1/0430/7252/0352/files/23196958978.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/1999/files/kegoli.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/metonesatedugow.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_off0000ae81.bin
3185572cd3ba1c49db476d4100dc1948f19ce1281c40c9aabe3738981a2d44c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE81 5200 bytes
font_01_sfnt_off0000c040.bin
22cb108318f45112e0d85fd07298efb3e3d77bbcd437a4e9f4bab87ec752188b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC040 10420 bytes

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