Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ab8897c7ca41e88…

MALICIOUS

PDF

44.9 KB Created: 2020-08-19 03:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c336e9913ec1a922724cc6fac387d0d SHA-1: 9657bd15c8bce321f0dccdb96a7e4f6a1727363e SHA-256: 2ab8897c7ca41e8844988d362645fb5b16fb700ad6ad5866c934dc0f4f0f4f6e
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=lombriz+roja+californiana+pdf'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous links to external PDFs, many hosted on Shopify. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL, suggesting an attempt to lure users to a malicious site.

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=lombriz+roja+californiana+pdf
    • http://files.adparametrik.com/uploads/1/3/2/7/132740949/55951.pdf
    • http://dutuze.naude.eu/uploads/1/3/1/4/131410299/dewekasok_mijab.pdf
    • http://files.melindatuhus.net/uploads/1/3/0/7/130775970/ribufaximoz-fixigufelen-dapujab-damarorarepul.pdf
    • https://cdn.shopify.com/s/files/1/0437/3102/6071/files/evan_almighty_movie.pdf
    • https://cdn.shopify.com/s/files/1/0430/3765/5191/files/57423267976.pdf
    • https://cdn.shopify.com/s/files/1/0431/2639/0946/files/quarterly_report_format.pdf
    • https://cdn.shopify.com/s/files/1/0439/5125/9803/files/the_gettysburg_address_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/6213/1869/files/zefevuzosiko.pdf
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/77622204031.pdf
    • https://cdn.shopify.com/s/files/1/0434/4456/8216/files/syllable_structure_processes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lugapib.pdf
    • https://cdn.shopify.com/s/files/1/0452/8907/8946/files/jurnal_dermatitis_atopik.pdf
    • https://cdn.shopify.com/s/files/1/0440/9799/4904/files/agneepath_full_movie_720p_filmywap.pdf
    • https://cdn.shopify.com/s/files/1/0435/3120/6808/files/dituganulunoxilonevi.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_off00006291.bin
4f9d31f3d90a2e92ef1f9ae0e9aced3a1c29d730e27fe0b1e5d956efb4d1d290		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6291 4920 bytes
font_01_sfnt_off00007323.bin
b51934b7da7e438dad68ba511cdd90e62f8ba2cf5b36ea44076ac8415e838741		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7323 10556 bytes
font_02_sfnt_off00009733.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9733 4324 bytes

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