Malicious PDF — malware analysis report

Static analysis result for SHA-256 60cb57e6336c7a90…

MALICIOUS

PDF

42.6 KB Created: 2020-08-30 01:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56e109a16c91b8b46b9c6da9344d084f SHA-1: 849907c2e49a03837a2be19a6637b23a91626eea SHA-256: 60cb57e6336c7a9020f6bff581abfa225937774302abe9ba8f67008162156742
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent. The document body, though heavily obfuscated, contains the malicious URL and a large number of benign Shopify links, suggesting a link farm or SEO spam tactic to disguise malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=pokemon+ruby+randomizer+gba+rom
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3786/7687/files/stuart_wilde_miracles.pdf
    • https://cdn.shopify.com/s/files/1/0439/4267/4587/files/lewijel.pdf
    • https://cdn.shopify.com/s/files/1/0435/5856/8097/files/28011827036.pdf
    • https://cdn.shopify.com/s/files/1/0434/4273/3221/files/jemedodeberunepo.pdf
    • https://cdn.shopify.com/s/files/1/0446/1743/3251/files/on_intelligence_jeff_hawkins.pdf
    • https://cdn.shopify.com/s/files/1/0437/9040/1687/files/sefegepakigoposapekuk.pdf
    • https://cdn.shopify.com/s/files/1/0437/6766/0706/files/mu_powerpoint_p_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/1028/3931/files/81691286730.pdf
    • https://cdn.shopify.com/s/files/1/0429/5199/9637/files/corn_snakes_care_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/3070/6333/files/torch_browser_setup_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0437/8034/1917/files/physically_and_mentally_challenged.pdf
    • https://cdn.shopify.com/s/files/1/0431/7482/2044/files/razati.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/14630592669.pdf
    • https://cdn.shopify.com/s/files/1/0429/2280/3366/files/98289060791.pdf
    • https://cdn.shopify.com/s/files/1/0430/8582/4164/files/jupivusekaletak.pdf
    • https://cdn.shopify.com/s/files/1/0433/3443/4969/files/early_childhood_education_definition.pdf
    • https://cdn.shopify.com/s/files/1/0438/5511/8501/files/96922035255.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/koxumugude.pdf
    • https://cdn.shopify.com/s/files/1/0465/1863/2598/files/iflytek_co._ltd_annual_report.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006739.bin
cc456cd2f8f4ce42c550976c48d1c1b19f7eef00faba14d1918f09178af1a55f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6739 5292 bytes
font_01_sfnt_off0000792c.bin
24d67c5076304ce6a65e2b5a5f24a0ac6d926a5b5246578fb42eac9eac453c28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x792C 10788 bytes

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