Malicious PDF — malware analysis report

Static analysis result for SHA-256 e407d48274a02b17…

MALICIOUS

PDF

57.2 KB Created: 2020-07-23 03:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7c3f14d010f3a75d4a3e44c906ad62c SHA-1: e8ec78451c60183a724ee4c44fae95b7d91eff41 SHA-256: e407d48274a02b17d56a91438be9ab5d1fd888ced9b263a9a0e46dabbba2d040
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to external resources. One critical heuristic indicates a malicious redirector link, and another identifies a PDF link farm with SEO manipulation. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to click on these links, likely leading to a malicious site.

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=earth+work+calculation+in+excel+pdf
    • http://files.heartwoodpc.com/uploads/1/3/2/6/132681992/fcde3ca3adab17.pdf
    • http://files.mabellephoto.net/uploads/1/3/1/6/131606390/xalezebu-razalifinufiwop.pdf
    • http://files.phhsl.co.uk/uploads/1/3/2/6/132681672/2982381.pdf
    • https://cdn.shopify.com/s/files/1/0430/8126/9401/files/pukidamikixaxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/0811/5366/files/65014910449.pdf
    • https://cdn.shopify.com/s/files/1/0432/7197/9172/files/4282758544.pdf
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/32798214951.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/zovegelizidufudixiwab.pdf
    • https://varuvotek.files.wordpress.com/2020/07/52589917881.pdf
    • https://pofemowawaj.files.wordpress.com/2020/06/kutenopesenijesitumuzivo.pdf
    • https://nagivujopig.files.wordpress.com/2020/06/vewoxe.pdf
    • https://wenopunufata.files.wordpress.com/2020/06/44208307973.pdf
    • https://cdn.shopify.com/s/files/1/0432/2597/2904/files/badavawiluxafetaliz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9832/5663/files/waziriwolikowafozereke.pdf
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/kabukituxutevig.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowojemabedeju.pdf
    • https://cdn.shopify.com/s/files/1/0431/4978/7285/files/jepenexoxemurulokakudulel.pdf
    • https://cdn.shopify.com/s/files/1/0431/3346/8839/files/84534649461.pdf
    • https://cdn.shopify.com/s/files/1/0432/5061/4429/files/fisabeji.pdf
    • https://cdn.shopify.com/s/files/1/0431/0794/2549/files/95546730412.pdf
    • https://cdn.shopify.com/s/files/1/0433/2106/5640/files/26433778995.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48975286879.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_off0000a4b6.bin
0482e4f23efd646370309a87087b2aec305befd98d5a054ca7c9ec34452cb25a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4B6 5128 bytes
font_01_sfnt_off0000b632.bin
7e8526a378a4409d6661532079dec5e2c6ae5267411aa32b836e43ade2a83d86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB632 9464 bytes

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