Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc41cb2c247ee62…

MALICIOUS

PDF

46.1 KB Created: 2020-08-04 18:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a7cacc9049132581ccdf34039b1230e SHA-1: b6212cb02aae61b9dfebaf08639dfc454e3b4d24 SHA-256: fdc41cb2c247ee62bc33a160bf677bee62b4b273735ea6f41feff6f5f6d1e2bc
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which are hosted on Shopify and appear to form a link farm intended to manipulate search engine results. One of the embedded links, 'https://ttraff.ru/pify?keyword=ankle+arthrodesis+technique+pdf', points to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to be largely junk data, but the presence of the malicious redirector and the link farm strongly suggest a malicious intent, likely for SEO poisoning or to redirect users to malicious sites.

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=ankle+arthrodesis+technique+pdf
    • http://files.westfieldbouncehouserentals.com/uploads/1/3/1/3/131384789/4605166.pdf
    • http://files.cateringandcreations.net/uploads/1/3/0/8/130814513/9295549.pdf
    • http://files.thministry.net/uploads/1/3/0/7/130739043/juzajazeloz.pdf
    • http://files.amyowendoulaservices.com/uploads/1/3/1/4/131452733/eae67.pdf
    • https://cdn.shopify.com/s/files/1/0429/6487/7471/files/24998092910.pdf
    • https://cdn.shopify.com/s/files/1/0431/6427/0743/files/tipebukoba.pdf
    • https://cdn.shopify.com/s/files/1/0437/7791/7085/files/world_of_final_fantasy_icicle_ridge.pdf
    • https://cdn.shopify.com/s/files/1/0431/1921/4756/files/mezasisakipoxopizebo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/200349851.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/34564225022.pdf
    • https://cdn.shopify.com/s/files/1/0436/9573/4937/files/kujunuzaxidugum.pdf
    • https://cdn.shopify.com/s/files/1/0435/3848/1311/files/98571864006.pdf
    • https://cdn.shopify.com/s/files/1/0438/4977/7312/files/41381263787.pdf
    • https://cdn.shopify.com/s/files/1/0436/0182/1859/files/98109692957.pdf
    • https://cdn.shopify.com/s/files/1/0430/6354/1913/files/xarabeguwimibajosinekik.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/biludetejuvujatolometa.pdf
    • https://cdn.shopify.com/s/files/1/0438/4168/3618/files/modivudi.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_off00007697.bin
dda5673a0d364fdf7e0556bb0c1ee06738a65c79592088d05925fa991c001ea4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7697 5420 bytes
font_01_sfnt_off00008903.bin
3e3030dbb08227e7fae0d8f36d8459439208b442fd297e58573355f38043e730		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8903 10008 bytes

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