Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43fea03e91fcb37…

MALICIOUS

PDF

54.4 KB Created: 2020-08-21 16:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c55088c01c082d65ef1428de59c88fbf SHA-1: bb64a5fb7b0aaad3404137a333af8c6fbed61d41 SHA-256: a43fea03e91fcb376011ccfa0c3463a5a96e5f24ff1a714201b974f8d08bbe05
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to software updates, suggesting a lure. The primary malicious URL identified is ttraff.ru, which is used to redirect users to potentially harmful content. The presence of a link farm heuristic further indicates a malicious intent to drive traffic to external sites.

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=xiaomi+mi+a3+actualizacion+android+10
    • http://files.nationalninja.com/uploads/1/3/0/7/130739457/larenoda.pdf
    • http://vuxopad.medtechwearables.com/uploads/1/3/1/3/131379730/7769098.pdf
    • https://cdn.shopify.com/s/files/1/0434/0265/7957/files/brother_se400_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96226605796.pdf
    • https://cdn.shopify.com/s/files/1/0431/6302/5559/files/centos_restart_network.pdf
    • https://cdn.shopify.com/s/files/1/0429/2476/9436/files/kuxazalozakogimedibuwaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/0253/5840/files/ratowipavavifekuj.pdf
    • https://cdn.shopify.com/s/files/1/0435/8648/6440/files/44804082147.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bodadajigewodozisidezufe.pdf
    • https://cdn.shopify.com/s/files/1/0433/4836/1375/files/lidubug.pdf
    • https://cdn.shopify.com/s/files/1/0431/8996/0865/files/fafifupolazofetata.pdf
    • https://cdn.shopify.com/s/files/1/0436/3943/9510/files/62416883852.pdf
    • https://cdn.shopify.com/s/files/1/0429/3810/6023/files/datazatekikezisu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6635/9962/files/40014495223.pdf
    • https://cdn.shopify.com/s/files/1/0440/6224/5029/files/principles_of_biotechnology_and_genetic_engineering.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006615.bin
a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6615 6440 bytes
font_01_sfnt_off00007609.bin
71e06afbc7dd6b15d138f2dbc2cca922ca433f434291072f61aa136c6ac18bb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7609 5292 bytes
font_02_sfnt_off000087e8.bin
cadc5f0a81d9e6a4fb32b35a9158a494a8d9caa15323165630cf35261d096584		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87E8 2268 bytes
font_03_sfnt_off00009245.bin
e63668309ba00c48bc639aac70e7a92e24103ebf35285cfe7ead11e6a81b9daa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9245 10572 bytes
font_04_sfnt_off0000b6a0.bin
9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A0 16036 bytes

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