Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e1e94e1b6e0c0e…

MALICIOUS

PDF

55.5 KB Created: 2020-08-12 02:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35df5f867b03c1428ad5d316f230259a SHA-1: 6cae9d3711149d2f29cbfd9263d758d3c89751cf SHA-256: d4e1e94e1b6e0c0eb5b22fc4abe7e357e2f760e0cf50d1fea948baa61493ef5f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The document body itself is heavily obfuscated but contains the malicious URL, suggesting the primary purpose is to lure the user to a malicious site. 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.ru/pify?keyword=ashtavinayak+map+pdf
    • http://files.embroideryequipment.com.au/uploads/1/3/1/3/131379085/xovema.pdf
    • http://files.skatingclubofjacksonhole.com/uploads/1/3/1/3/131380641/vuduxajebusetepepat.pdf
    • http://files.worldseatraveler.com/uploads/1/3/2/6/132681634/tomasikojufaduweso.pdf
    • http://momelez.littlepipsparties.com.au/uploads/1/3/0/8/130873995/sepobirak.pdf
    • https://cdn.shopify.com/s/files/1/0446/9909/1098/files/past_simple_past_continuous_present_perfect_exercise.pdf
    • https://cdn.shopify.com/s/files/1/0428/6794/9724/files/25883234636.pdf
    • https://cdn.shopify.com/s/files/1/0433/0360/0283/files/43383009354.pdf
    • https://cdn.shopify.com/s/files/1/0434/0498/4474/files/biography_definition.pdf
    • https://cdn.shopify.com/s/files/1/0429/0933/5715/files/volugaxufagurogekelarez.pdf
    • https://cdn.shopify.com/s/files/1/0436/9698/0136/files/jitatogejesaxatew.pdf
    • https://cdn.shopify.com/s/files/1/0430/6547/5226/files/sutixemurivijekip.pdf
    • https://cdn.shopify.com/s/files/1/0438/4922/0258/files/a_dozen_a_day_mini_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/3062/5950/files/72694214834.pdf
    • https://cdn.shopify.com/s/files/1/0432/5962/5627/files/cost_behaviour_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0438/2749/5074/files/rugaginapuxonixidowevig.pdf
    • https://cdn.shopify.com/s/files/1/0437/8122/6657/files/ruxaximun.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008cf0.bin
461f7071ba382056d790096d9b75f0c2fbad3d6b3587b55cbc08378b001b1ca8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF0 5368 bytes
font_01_sfnt_off00009f1a.bin
8c9906955b6eff06c702dae9b0b628630108144d18f553aad8418a7085cb2d92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F1A 10160 bytes
font_02_sfnt_off0000c210.bin
fa197dd24370fcf0636a8c2360960f09d82931ae4fd739b710d73bf8d97f1d3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC210 3336 bytes

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