Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf2c27977bacd99…

MALICIOUS

PDF

60.6 KB Created: 2020-08-24 03:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f32de8d553ae325fe41494069d604e5c SHA-1: 382d189973fa343ad119e99ea0bc85d0941c69c0 SHA-256: 1cf2c27977bacd99cbe8edec929db975f5d4d805ea68c1864f9daecdbda9c97f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous links to external resources, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=apache+poi+jar+files+free', suggesting a lure to a malicious site. The presence of a large number of external links, many hosted on Shopify, indicates a potential link farm or SEO manipulation tactic to distribute malicious content.

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=apache+poi+jar+files+free
    • http://files.sylviaparkinsonbrown.com/uploads/1/3/1/0/131070751/mexefezireri.pdf
    • http://files.becican.com/uploads/1/3/2/6/132695329/986a5611.pdf
    • http://tiluwami.plateauvalleyanimalhospital.com/uploads/1/3/0/9/130969627/b893b.pdf
    • http://files.caregiverscontact.com/uploads/1/3/1/3/131380058/serur.pdf
    • https://cdn.shopify.com/s/files/1/0429/8014/7359/files/convert_jpg_to_vector_free.pdf
    • https://cdn.shopify.com/s/files/1/0439/3867/6894/files/data_analysis_excel_for_dummies.pdf
    • https://cdn.shopify.com/s/files/1/0431/5647/1970/files/wastewater_treatment_process_flow_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0433/9220/4950/files/72845267176.pdf
    • https://cdn.shopify.com/s/files/1/0434/7294/5312/files/96213708777.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/dijoriwikumemeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/3844/0598/files/avenir_medium_font.pdf
    • https://cdn.shopify.com/s/files/1/0433/8188/3030/files/56872261937.pdf
    • https://cdn.shopify.com/s/files/1/0431/4293/8784/files/53095891120.pdf
    • https://cdn.shopify.com/s/files/1/0439/8999/1582/files/vavepunad.pdf
    • https://cdn.shopify.com/s/files/1/0429/6327/1833/files/personal_balance_sheet_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0434/2041/8198/files/anatomy_bd_chaurasia_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mevebetivegukubevam.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_off0000a22f.bin
b87d70d9ea19e889a676d417e7e128fccec0e3b6017503e1a81948dbe1cea31d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA22F 5168 bytes
font_01_sfnt_off0000b3ba.bin
2706127639a33e4e33675b5fefdda268cd4fb4f1af3b684731d2031cc0c4aa81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BA 16024 bytes

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