Malicious PDF — malware analysis report

Static analysis result for SHA-256 a323b34951838d93…

MALICIOUS

PDF

42.9 KB Created: 2020-08-11 00:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb86a165f8cb14fa711c95353a7d294e SHA-1: 0fa9231e5217d1c70d93418d097b28cb8474a5aa SHA-256: a323b34951838d9354130277ad5302e6754ecd585898e49763500139c8d4e14b
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link redirects to a known malicious infrastructure at 'ttraff.cc'. The document body, though heavily obfuscated, contains the text 'Human anatomy glossary pdf' and the malicious URL, suggesting a lure to disguise the malicious redirector. The ML classifier strongly supports the malicious verdict.

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=human+anatomy+glossary+pdf
    • http://files.sarahlindsayphotography.com/uploads/1/3/1/6/131637308/fddd14.pdf
    • http://files.wordsbykurt.com/uploads/1/3/1/8/131871658/nomurasiro-gatovubag-nanebu-fikog.pdf
    • http://files.legaljj.com/uploads/1/3/1/3/131379828/9025618.pdf
    • https://cdn.shopify.com/s/files/1/0427/7587/1654/files/41553976744.pdf
    • https://cdn.shopify.com/s/files/1/0432/2869/2643/files/mivofimovokekivokol.pdf
    • https://cdn.shopify.com/s/files/1/0437/3273/0017/files/iobit_uninstaller_8._6_key.pdf
    • https://cdn.shopify.com/s/files/1/0430/2720/2205/files/86728605972.pdf
    • https://cdn.shopify.com/s/files/1/0435/9307/2808/files/4930413820.pdf
    • https://cdn.shopify.com/s/files/1/0436/1119/3501/files/binary_subtraction_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3219/files/76167056985.pdf
    • https://cdn.shopify.com/s/files/1/0434/2372/7783/files/53817188674.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5965/files/19625655399.pdf
    • https://cdn.shopify.com/s/files/1/0429/1395/6007/files/34561159290.pdf
    • https://cdn.shopify.com/s/files/1/0428/2230/3911/files/lista_vencida_axn_cover.pdf
    • https://cdn.shopify.com/s/files/1/0429/7526/4919/files/levutum.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/najinob.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8903/files/13675089985.pdf
    • https://cdn.shopify.com/s/files/1/0433/3525/4171/files/megoxoxatejepufefek.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_off00006aad.bin
563c60375fcd88216f9dbd45d898280b65ee745c6c60a12863850a12eccf2c31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AAD 5424 bytes
font_01_sfnt_off00007d0f.bin
31c128f1507c184708dee60e3ab8ede754061cb2bbb758d96f6ea03db7c42f34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D0F 9860 bytes

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