Malicious PDF — malware analysis report

Static analysis result for SHA-256 4338ed7820e292c5…

MALICIOUS

PDF

32.5 KB Created: 2020-08-12 09:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34f774699aeed2a1be3b1f63aac96820 SHA-1: a8aaf72cda4c0dbca2e459177374eaaba56bf91c SHA-256: 4338ed7820e292c50bd6e585496618fc15e351b0c7ae9c31cbce38d6418f4745
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector at `ttraff.cc`. The document body, though partially corrupted, suggests a lure related to a 'Bizerba a400 service manual', aiming to trick users into clicking the malicious link. The presence of a large number of external PDF links also indicates a link farm, likely for SEO poisoning or to obscure the malicious destination.

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/wb?keyword=bizerba%20a400%20service%20manual
    • http://files.nedmechurch.org/uploads/1/3/2/6/132681634/juleturoxe.pdf
    • http://files.roboticsengineeringcte502.com/uploads/1/3/0/8/130813448/solixitesisenu-tunolelu-rinuwe-kuxuwaxajaneded.pdf
    • http://lofofu.firestartershrines.com/uploads/1/3/1/6/131636725/wekuwe_nawunu_mevad_bosopiwigirewex.pdf
    • http://menovano.dremilyhaozous.com/uploads/1/3/1/4/131409090/vilejezem-xuvumofapapagi.pdf
    • http://files.coldcountryqueens.com/uploads/1/3/0/7/130775977/ec14415215.pdf
    • https://cdn.shopify.com/s/files/1/0432/7600/9622/files/neet_biology_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ligumugazawebamupewav.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89853177043.pdf
    • https://cdn.shopify.com/s/files/1/0430/8572/5857/files/adosphere_1_cahier_d_activits_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/7700/8548/files/sap_bpc_documentation.pdf
    • https://cdn.shopify.com/s/files/1/0431/2236/0469/files/52536590877.pdf
    • https://cdn.shopify.com/s/files/1/0434/5672/5153/files/20636274464.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3762/files/python_2._7_9.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/41722429979.pdf
    • https://cdn.shopify.com/s/files/1/0437/1605/1109/files/31047026774.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3077/files/ffxv_strategy_guide_download.pdf
    • https://cdn.shopify.com/s/files/1/0455/4752/0165/files/alzheimer_diagnstico_y_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0431/1551/1964/files/botobapetakotiven.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_off000045b9.bin
9778a70a09fe31051e726d362d9d658e8ca306e9a27c0b513fa5185272e8b6a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45B9 5472 bytes
font_01_sfnt_off0000584d.bin
b1cf48d5d78b98830046b24cab5f4d478b72fe89b342f6af947ae64b75171190		 pdf-font-stream PDF embedded font (sfnt) at offset 0x584D 8608 bytes

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