Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5f295295181a43…

MALICIOUS

PDF

44.7 KB Created: 2020-08-20 22:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e26e6e104b2cbbd870333bdc294effa9 SHA-1: 60158aed0303ca9d747efa31135da47ceacaf20d SHA-256: 8c5f295295181a438c0328014242eee115f93343199787833dc9af910b1e18bd
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. This URL is embedded within the document body, disguised as a link to a 'medicinal chemistry book by sriram pdf'. The PDF also exhibits characteristics of a link farm, with numerous external links, many hosted on Shopify domains. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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=medicinal+chemistry+book+by+sriram+pdf
    • http://files.jenniferhainesmua.com/uploads/1/3/1/6/131636775/sipusutewovome.pdf
    • http://refabagek.pcsmith2.com/uploads/1/3/1/0/131070450/tofunop-zuvewe-potifopesaz.pdf
    • http://files.cliniqueveterinairedecantley.com/uploads/1/3/1/0/131070508/bodizudexudu.pdf
    • http://files.hairbyjacqueline.com/uploads/1/3/1/3/131398020/xuvaz-lajabisimodamab.pdf
    • https://cdn.shopify.com/s/files/1/0433/8758/4675/files/43898408415.pdf
    • https://cdn.shopify.com/s/files/1/0437/3010/8577/files/wamota.pdf
    • https://cdn.shopify.com/s/files/1/0433/6667/8696/files/pejarubenewixoxikijutala.pdf
    • https://cdn.shopify.com/s/files/1/0429/8326/0314/files/50214859165.pdf
    • https://cdn.shopify.com/s/files/1/0437/7670/4664/files/oracle_sql_developer_manual.pdf
    • https://cdn.shopify.com/s/files/1/0450/9771/3829/files/67013736084.pdf
    • https://cdn.shopify.com/s/files/1/0457/3685/3660/files/couplet_poem_format.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3881/files/betternet_premium_version_apk.pdf
    • https://cdn.shopify.com/s/files/1/0430/4902/5690/files/dejefujafodefuxerubowomur.pdf
    • https://cdn.shopify.com/s/files/1/0429/0985/9999/files/full_form_of_atmosphere.pdf
    • https://cdn.shopify.com/s/files/1/0431/8108/0738/files/samewewejekinagibomedef.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000626e.bin
85561d9982e25170e86c192cfa50d2a3eb0493378ae18caff6feee5f5fc92c34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x626E 5492 bytes
font_01_sfnt_off000074e6.bin
9b674adfa280a2137278b33cd18eccc38f54eb3b1b2dbe52f9d4ae5d623eb0a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74E6 10272 bytes
font_02_sfnt_off0000980f.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x980F 4324 bytes

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