Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf40c7c45c980657…

MALICIOUS

PDF

41.3 KB Created: 2020-08-14 02:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0aba0925178773bec368cae8498109d3 SHA-1: e4356023e38e1822251c477c9657e779c4661da3 SHA-256: cf40c7c45c980657a3b248a68ed9e28ed32519b339d94a062647feea29fee80e
152 Risk Score

Malware Insights

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

The PDF contains a deceptive lure, presenting itself as a 'Us jacket size guide' while embedding a link to a known malicious redirector. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms this, and the ML_NYX_PDF_MALICIOUS score indicates a high probability of malicious intent. The document also functions as a link farm, directing to numerous other PDFs, likely to obscure the primary malicious destination.

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=us+jacket+size+guide
    • http://files.villarosavisuals.com/uploads/1/3/0/9/130970004/bdf54689e.pdf
    • http://files.cristinasbridalma.com/uploads/1/3/0/8/130874544/vuparapisid_laparunokobufi_kigumuzuzebu_nukoxugifine.pdf
    • http://lewokin.ridgwayhistoricna.org/uploads/1/3/1/3/131383908/5341159.pdf
    • http://tisujubux.beo-foto.com/uploads/1/3/1/0/131070761/412854be.pdf
    • http://bujegok.thefightingwarriors.com/uploads/1/3/2/6/132683014/7621205.pdf
    • https://cdn.shopify.com/s/files/1/0440/4733/5574/files/2008_ford_focus_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/0514/1411/files/vadezane.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/5496531918.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/xifuwufesuma.pdf
    • https://cdn.shopify.com/s/files/1/0431/7616/5536/files/midebot.pdf
    • https://cdn.shopify.com/s/files/1/0437/4007/0042/files/vunutuvabonijepug.pdf
    • https://cdn.shopify.com/s/files/1/0432/7807/4020/files/14895737494.pdf
    • https://cdn.shopify.com/s/files/1/0438/4564/8546/files/dirt_bike_games.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mofofuledezenededur.pdf
    • https://cdn.shopify.com/s/files/1/0431/8396/4324/files/nasegexura.pdf
    • https://cdn.shopify.com/s/files/1/0433/3345/1926/files/62940029427.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wulusiwebope.pdf
    • https://cdn.shopify.com/s/files/1/0429/5586/6263/files/marefijegalafugofijela.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_off00006560.bin
2af16a38dbb61385f6e9cf4130114cd36cf0636c6123c2babf50e35715578a6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6560 5160 bytes
font_01_sfnt_off00007710.bin
64dbd240325f247fc2cbde25ccd782236c3a48a6321beded2b206b76a77fe2e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7710 9796 bytes

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