Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c05548748b9af76…

MALICIOUS

PDF

45.4 KB Created: 2020-08-11 18:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09afe83ec2d4546d1fc1bb628dcbbd19 SHA-1: c82c0f9d47d67cac6cd49fd139d68b19d5d69317 SHA-256: 4c05548748b9af76b99c767ad1786e620a050287811c684d5703b404e68e4236
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=cpns+bandung+barat+2020+pdf'. This URL is embedded within the document body, suggesting a phishing or social engineering lure. The presence of numerous other links to external PDFs, many hosted on Shopify, indicates a link farm strategy, likely to obscure the malicious redirector or to improve search engine ranking for malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=cpns+bandung+barat+2020+pdf
    • http://files.thelakecampground.com/uploads/1/3/2/7/132741023/vofolomi.pdf
    • http://files.silverjewellerybypeterkibbles.com/uploads/1/3/1/4/131453998/7325050.pdf
    • http://files.petiakostadinova.net/uploads/1/3/1/6/131606407/fokazadugot_bupowogetum_givules_toxelebafatiju.pdf
    • http://files.lomalivestock.com/uploads/1/3/1/4/131438667/ecded.pdf
    • http://files.thesharpeningstone.com/uploads/1/3/1/3/131381919/jowowutimogoxo.pdf
    • http://files.thel
    • https://cdn.shopify.com/s/files/1/0440/7810/4728/files/google_search_site_for.pdf
    • https://cdn.shopify.com/s/files/1/0438/1533/8144/files/81817356238.pdf
    • https://cdn.shopify.com/s/files/1/0434/3139/5478/files/temebapamajuzekerudami.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/17558176110.pdf
    • https://cdn.shopify.com/s/files/1/0433/5458/7288/files/charlie_and_the_chocolate_factory_characters.pdf
    • https://cdn.shopify.com/s/files/1/0434/0609/8597/files/ramuvanefonajokamozudu.pdf
    • https://cdn.shopify.com/s/files/1/0436/0863/7602/files/download_spanish_to_english_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0437/5222/6974/files/58768652885.pdf
    • https://cdn.shopify.com/s/files/1/0434/9011/5748/files/echo_pb-_2100_operating_manual.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_off0000733e.bin
3c98dee4e5f5d9024241001c779c933a8fa4f56786c8e679bc3cccc85d8639ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x733E 5496 bytes
font_01_sfnt_off000085ee.bin
23ce94a7ad9482234cdbb3344a09fbaf8da2b8e99f6a5d496fa60809f88aa7a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85EE 10196 bytes

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