Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa8a104967c813e…

MALICIOUS

PDF

40.2 KB Created: 2020-08-13 03:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e20dbf5b42a663d1a2566a8f68e397ab SHA-1: 9bad675bc7f75f4a0fe89a5c2f85200094ed60f7 SHA-256: afa8a104967c813e557db9a3f6df8fe68e46ccdb024ddb01a68a5b904a58a4d9
154 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and contains numerous embedded links. One of these links, 'https://ttraff.ru/pify?keyword=bamhi+fermentas+pdf', is identified as a malicious redirector. The document also exhibits characteristics of a link farm, with many URLs pointing to external resources, suggesting an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. No scripts were extracted, but the high number of links and the malicious redirector indicate a likely phishing or redirection attack.

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=bamhi+fermentas+pdf
    • http://files.fridaylawrencesilverwear.com/uploads/1/3/0/7/130775974/8603093.pdf
    • http://files.josephkimchiro.com/uploads/1/3/1/6/131606101/4894614.pdf
    • http://vuraja.cre8tivemarketingagency.com/uploads/1/3/1/4/131437462/6693067.pdf
    • https://cdn.shopify.com/s/files/1/0436/5815/0046/files/older_versions_of_adobe_reader.pdf
    • https://cdn.shopify.com/s/files/1/0428/2623/6071/files/bebinavulidabaxofom.pdf
    • https://cdn.shopify.com/s/files/1/0430/9775/1709/files/paradise_lost_bangla_onubad.pdf
    • https://cdn.shopify.com/s/files/1/0433/1044/8798/files/nopupuludi.pdf
    • https://cdn.shopify.com/s/files/1/0435/9559/5938/files/89879359546.pdf
    • https://cdn.shopify.com/s/files/1/0447/8559/8615/files/adaptive_optics_in_astronomy_roddier.pdf
    • https://cdn.shopify.com/s/files/1/0430/8667/6117/files/the_rock_vs_brock_lesnar.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/niwanupejezibipemakoreka.pdf
    • https://cdn.shopify.com/s/files/1/0429/6350/1222/files/mario_brothers_games_for_ps3.pdf
    • https://cdn.shopify.com/s/files/1/0436/5221/9030/files/evangelio_apocrifo_de_juan.pdf
    • https://cdn.shopify.com/s/files/1/0433/6638/3768/files/nexevarirov.pdf
    • https://cdn.shopify.com/s/files/1/0433/4718/1718/files/84312773524.pdf
    • https://cdn.shopify.com/s/files/1/0430/4273/4237/files/19371308262.pdf
    • https://cdn.shopify.com/s/files/1/0432/9121/3988/files/chinese_language_lessons.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_off00005fba.bin
8b78df4d233ccc1ca88c7e192731a9fc2d2f3ff6c051384abd3753d66071200f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBA 5300 bytes
font_01_sfnt_off00007194.bin
403f84e1c072646612e3cd4fb5aa9a9eac9caecc94429b6a211b727d8b660ea4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7194 10176 bytes

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