Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1319772c8c5afc9…

MALICIOUS

PDF

53.7 KB Created: 2020-08-06 03:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21213fb898aefb67fb4fd578a71d97cd SHA-1: bbaf33ba69a3293bedb8e2521569222b86047b49 SHA-256: a1319772c8c5afc9e4d245242c14a8166f6a44edf4eff656740da5e01afb59f1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing:Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a critical heuristic for containing a malicious redirector link and a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://ttraff.com/pify?keyword=alimentacion+saludable+pdf+oms. While no scripts were extracted, the presence of numerous links, including one pointing to a known malicious redirector, indicates a high likelihood of malicious intent, possibly to lead users to phishing sites or malware downloads.

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.com/pify?keyword=alimentacion+saludable+pdf+oms
    • http://files.ameliasclosetfilm.com/uploads/1/3/0/7/130740530/pegufifegiv.pdf
    • http://wikilas.chefmikescharcoalgrill.com/uploads/1/3/2/6/132682883/degusitadefu.pdf
    • http://files.ranellekirchner.com/uploads/1/3/2/6/132681054/7b617971b.pdf
    • http://files.gardenspotrentals.net/uploads/1/3/2/6/132681938/finefenusavat.pdf
    • http://sawev.upperskagitlibraryfoundation.org/uploads/1/3/2/7/132740214/jesubuzeperozune.pdf
    • https://cdn.shopify.com/s/files/1/0430/8277/6727/files/28108280769.pdf
    • https://cdn.shopify.com/s/files/1/0429/8450/5498/files/dawafulila.pdf
    • https://cdn.shopify.com/s/files/1/0432/9360/6046/files/rekovet.pdf
    • https://cdn.shopify.com/s/files/1/0431/6944/8097/files/b._pharm_colleges_in_tamilnadu_2020.pdf
    • https://cdn.shopify.com/s/files/1/0439/5145/6411/files/autocad_2020_tutorial_3d_modeling.pdf
    • https://cdn.shopify.com/s/files/1/0428/6880/1702/files/90208072115.pdf
    • https://cdn.shopify.com/s/files/1/0438/6209/8085/files/43740362720.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pepefawabibuf.pdf
    • https://cdn.shopify.com/s/files/1/0439/1020/1499/files/radozojuxigiwenoweru.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/basufuxezisidum.pdf
    • https://cdn.shopify.com/s/files/1/0432/7034/0772/files/nezabe.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_off00009121.bin
74ca63d1b9f1bb39c1abbe36a35a0b0ea6d2eab7f9cbf13663c415af94ec25e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9121 5332 bytes
font_01_sfnt_off0000a32c.bin
3da52caab209b3f4b3e998b9dd9f5c18b7409b0c71fb285022edc7500953b750		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA32C 11444 bytes

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