Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7c779d0bf45dc8…

MALICIOUS

PDF

48.7 KB Created: 2020-08-10 23:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f40cd6604972b4f8b9309a6c526fb353 SHA-1: 1f2e55bbec2b4ead8e17ff8f0370f7191fd05ab7 SHA-256: 8f7c779d0bf45dc83a5f4494ae927d81bdf765760a69405aabf8f05daec3d68e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to deliver further malicious content. The document body, though partially corrupted, contains the same URL and references 'Nomenclature of alkanes pdf', suggesting a lure to trick users into clicking the malicious link. The presence of a large number of external PDF links also indicates a link farm for SEO manipulation, likely to improve the ranking of the malicious redirector. No scripts were extracted from this sample.

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=nomenclature+of+alkanes+pdf
    • http://files.multiaxis.llc/uploads/1/3/1/3/131379833/7645092.pdf
    • http://tivewi.townofhafford.ca/uploads/1/3/1/3/131383648/paxisivewera.pdf
    • http://pazuri.hannapachman.org/uploads/1/3/0/7/130775934/8815638.pdf
    • https://cdn.shopify.com/s/files/1/0429/7352/8213/files/28837297329.pdf
    • https://cdn.shopify.com/s/files/1/0437/2076/9685/files/littering_effects.pdf
    • https://cdn.shopify.com/s/files/1/0431/6204/2532/files/guvogozopisun.pdf
    • https://cdn.shopify.com/s/files/1/0429/4760/8730/files/99275444823.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87967576867.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/47437041729.pdf
    • https://cdn.shopify.com/s/files/1/0440/6453/8776/files/easy_money_movie.pdf
    • https://cdn.shopify.com/s/files/1/0430/1009/7313/files/8419299472.pdf
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/23883028890.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5435/files/43350679441.pdf
    • https://cdn.shopify.com/s/files/1/0429/2801/3471/files/85553929607.pdf
    • https://cdn.shopify.com/s/files/1/0430/4742/0066/files/gemeliworawelizub.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_off00007345.bin
2ce3c0da10e782104d829372cf20140ac4c9eee829016a3dba60edaf3d98fc5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7345 5168 bytes
font_01_sfnt_off000084bd.bin
1b6049149a0feb582b230cd46670f4e477d236805b41a3eaf6871fb38782eef0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84BD 10308 bytes
font_02_sfnt_off0000a7fa.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7FA 4324 bytes

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