Malicious PDF — malware analysis report

Static analysis result for SHA-256 270b8259b4cd4dd5…

MALICIOUS

PDF

79.1 KB Created: 2020-08-03 14:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b24996c7ec74f9993c04f2525849c35 SHA-1: f90d7fc0a4bb9f6223cf681eedfd9a99ae0c12d1 SHA-256: 270b8259b4cd4dd5a09b1ec2bfc298f5b08419c065d1df1b5b6396f026d43d3c
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text suggesting a lure related to AWS certifications. The presence of a large number of external PDF links, as indicated by 'PDF_SEO_LINK_FARM', further supports a malicious intent to distribute content through a link farm. The ML classifier strongly supports the malicious verdict.

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=aws+certified+solution+architect+pdf
    • http://files.beingbiars.com/uploads/1/3/1/4/131413718/dajitejinepazape.pdf
    • http://danekiton.garyscocktailmuddlers.com/uploads/1/3/0/8/130874317/782165db767.pdf
    • http://files.agrowingplace.ca/uploads/1/3/1/4/131411688/mutabeb_rorawax_resifom.pdf
    • http://files.community.jesstopia.org/uploads/1/3/1/3/131381204/5921658.pdf
    • https://cdn.shopify.com/s/files/1/0431/4349/5841/files/winipuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/7278/1478/files/80519094709.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71061356311.pdf
    • https://cdn.shopify.com/s/files/1/0434/4971/2806/files/95957988685.pdf
    • https://cdn.shopify.com/s/files/1/0428/2862/8135/files/94340358595.pdf
    • https://cdn.shopify.com/s/files/1/0434/5148/2278/files/fiwifitelavitejufak.pdf
    • https://cdn.shopify.com/s/files/1/0433/8368/5270/files/calculus_briggs_cochran_gillett.pdf
    • https://cdn.shopify.com/s/files/1/0434/4024/2840/files/wigagumodikom.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/11th_refraction_of_light.pdf
    • https://cdn.shopify.com/s/files/1/0434/7543/5677/files/3954958979.pdf
    • https://cdn.shopify.com/s/files/1/0429/7034/9731/files/fusepisutuv.pdf
    • https://cdn.shopify.com/s/files/1/0435/2825/7685/files/43565796604.pdf
    • https://cdn.shopify.com/s/files/1/0430/0262/6202/files/16916920528.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_off0000f395.bin
89a5cad6334c7f785657dbf862f5f033b316aa1ccd270510b953a7784080c48a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF395 5324 bytes
font_01_sfnt_off000105c2.bin
a3af59c106670eaba65fdd5888dd259d0949f15dce7f9744c70f2a4aaf8fd39b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105C2 14072 bytes

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