Malicious PDF — malware analysis report

Static analysis result for SHA-256 74555736014f68aa…

MALICIOUS

PDF

60.4 KB Created: 2020-08-06 20:39:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7592de4d301d72261a8ca5a7ae4241c1 SHA-1: a0202e0b54e30284223fd31575c9f20d9e3ad43f SHA-256: 74555736014f68aae68dced8562f304aba30c2160dd0ca0e040059d3971d6091
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to suspicious or unknown domains, suggesting a link farm or redirection scheme. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The presence of numerous external links, including a link farm, indicates an attempt to direct users to potentially harmful 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.ru/pify?keyword=acute+pyelonephritis+in+adults+nejm+pdf
    • http://files.atlanticbooking.com/uploads/1/3/0/9/130969354/jerusazupemanip.pdf
    • http://files.stj500westernus.com/uploads/1/3/1/3/131398292/e8ca0.pdf
    • http://files.freeheartclinic.com/uploads/1/3/0/7/130775744/49298f83004c00.pdf
    • http://files.pelletgrillcentral.com/uploads/1/3/0/9/130968921/vapenavided.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/1966/4540/files/pivomo.pdf
    • https://cdn.shopify.com/s/files/1/0438/4302/7106/files/kusag.pdf
    • https://cdn.shopify.com/s/files/1/0432/9363/8816/files/vozokinejamuvolamituw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65621046881.pdf
    • https://cdn.shopify.com/s/files/1/0437/6795/5610/files/pukomufuduxoretatumiwe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuwizesovipijekugufex.pdf
    • https://cdn.shopify.com/s/files/1/0431/1013/8017/files/90896405990.pdf
    • https://cdn.shopify.com/s/files/1/0435/9231/9138/files/41563236311.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/jocuri_cu_m_asini.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jomanumono.pdf
    • https://cdn.shopify.com/s/files/1/0430/6491/8165/files/51146664547.pdf
    • https://cdn.shopify.com/s/files/1/0433/9076/3175/files/35156612932.pdf
    • https://cdn.shopify.com/s/files/1/0428/4294/7750/files/nerobetejapikowevapi.pdf
    • https://cdn.shopify.com/s/files/1/0433/2814/3510/files/petariwid.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008517.bin
7fd6fb755c9781fa7bbbac25ffb686a060ea4ad60f5242e4e7eeeb9508e431f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8517 5444 bytes
font_01_sfnt_off00009773.bin
f35df4226923b088c36b22651a9e5e7d250311ada2c5a30eea63773d92576a43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9773 12728 bytes
font_02_sfnt_off0000c08c.bin
8edcde2a779730aee73c6d95060464c84d09ca400b50e41eb9b98ab64dbef0fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC08C 16112 bytes
font_03_sfnt_off0000d560.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD560 4324 bytes

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