Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e71333106e26879…

MALICIOUS

PDF

40.2 KB Created: 2020-08-11 16:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d722b688f7aaad321ab5b571d1d34b76 SHA-1: 6503a674f79281af431bde072a88541336a669e5 SHA-256: 3e71333106e26879e5d7844e529360d888317c0fa6cff2bc79f48ad25ef003d2
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 domains associated with link farms and redirectors. The primary malicious link identified is https://ttraff.cc/pify?keyword=ayyappa+bhajan+songs+lyrics+in+tamil+pdf, which is a known malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other Shopify-hosted PDFs, suggesting a tactic to disguise malicious content within a large number of seemingly legitimate links. The ML classifier also strongly indicated maliciousness.

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=ayyappa+bhajan+songs+lyrics+in+tamil+pdf
    • http://files.maileandrus-price.com/uploads/1/3/0/7/130775897/52641f9b.pdf
    • http://files.stillherethinkingofyou.com/uploads/1/3/1/1/131164419/kofidelisepib.pdf
    • http://files.jcembassypalestine.com/uploads/1/3/1/6/131606397/xagesukakogesamaduf.pdf
    • http://faripax.sai-deltamu.com/uploads/1/3/2/6/132681556/dugolev.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/tixifesure.pdf
    • https://cdn.shopify.com/s/files/1/0428/3600/0931/files/fewenapetezenewipuboj.pdf
    • https://cdn.shopify.com/s/files/1/0433/6713/7438/files/79005085877.pdf
    • https://cdn.shopify.com/s/files/1/0440/1646/8133/files/99462553517.pdf
    • https://cdn.shopify.com/s/files/1/0429/7503/5541/files/best_escape_from_tarkov_settings.pdf
    • https://cdn.shopify.com/s/files/1/0437/0300/9430/files/43175986264.pdf
    • https://cdn.shopify.com/s/files/1/0431/0846/6845/files/wave_equation.pdf
    • https://cdn.shopify.com/s/files/1/0433/0897/4235/files/4549356377.pdf
    • https://cdn.shopify.com/s/files/1/0431/9579/3557/files/brevet_pondichery_2020_sciences.pdf
    • https://cdn.shopify.com/s/files/1/0430/9165/6864/files/26_brain_gym_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0434/0213/3667/files/lelepives.pdf
    • https://cdn.shopify.com/s/files/1/0429/6055/2085/files/61317741083.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_off00005c24.bin
273b0a4de695183cde451d1186ed3a5817119d86d149955f3909f3c2a1ba9013		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C24 5876 bytes
font_01_sfnt_off00006ff1.bin
094d449bd191c740ccbbf89a4900be4c5f19d13bcc5b12742cd8846d9e9c4ab7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF1 10024 bytes

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