Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f9cc5a0c7ece2c…

MALICIOUS

PDF

37.4 KB Created: 2020-08-16 17:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed7e429723cdbaa689b2060feefe1bc4 SHA-1: 4cb882a9bca2e750920c4c6e03851508e9077419 SHA-256: e9f9cc5a0c7ece2cbdc286d183e5b2faaf37b1ff16a1ad776ee54a850e8d5ce5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=boden+shoes+size+guide', is designed to redirect users to malicious infrastructure. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDFs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering through a deceptive lure.

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=boden+shoes+size+guide
    • http://wemeponij.ballmania.com/uploads/1/3/2/8/132814930/d7cef043.pdf
    • http://files.drallicain.com/uploads/1/3/1/3/131380569/fisatekufug_mosopej.pdf
    • http://files.guerarddolls.com/uploads/1/3/1/4/131437924/totapevakuwura_tidoliwepomiwo_wovam.pdf
    • https://cdn.shopify.com/s/files/1/0450/5639/3379/files/12497906490.pdf
    • https://cdn.shopify.com/s/files/1/0435/4896/7061/files/75920282160.pdf
    • https://cdn.shopify.com/s/files/1/0433/0258/4480/files/vuvituweno.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8387/files/22238233943.pdf
    • https://cdn.shopify.com/s/files/1/0429/0222/5059/files/tojiwojebopeguzada.pdf
    • https://cdn.shopify.com/s/files/1/0431/6515/5489/files/movekewukexikonumowiluz.pdf
    • https://cdn.shopify.com/s/files/1/0436/4759/8742/files/human_anatomy_atlas_2019_apk_paid.pdf
    • https://cdn.shopify.com/s/files/1/0432/4645/2899/files/ambiguous_pronoun_reference.pdf
    • https://cdn.shopify.com/s/files/1/0433/3967/7861/files/javascript_transpose_array.pdf
    • https://cdn.shopify.com/s/files/1/0431/3464/8474/files/prebles_artforms_12th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/8706/7291/files/gezamava.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6586/files/wididorotowudukanuwi.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_off00005620.bin
e3be2aa2ea06ed5718af81992fa5a8b57b36e6fa368179fea81d9b0a035328d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5620 4848 bytes
font_01_sfnt_off000066a4.bin
ba9d60c02bbf3b8826e4865f56175b86e591b5f73bf7a8b9c1ab2ef681c59b89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66A4 10048 bytes

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