Malicious PDF — malware analysis report

Static analysis result for SHA-256 13122e3e27e0c3f9…

MALICIOUS

PDF

46.1 KB Created: 2020-08-30 00:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca6bbf4fbe19a2673c532ad4c76fe89f SHA-1: 9b63a9b32afdebbbb4c3a019aafa0c5031267320 SHA-256: 13122e3e27e0c3f919a13788d05ab43a7cf44962c6d97ea968e4ec4db302e4dd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to malicious infrastructure, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text related to search queries and URLs, suggesting a phishing or SEO-based lure. The presence of numerous external PDF links also indicates a link farm strategy. No scripts were extracted, but the overall structure and heuristics point to a malicious redirector used for initial access.

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/wix?keyword=consumer+reports+washing+machine+ratings
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/0611/6511/files/ziwunilew.pdf
    • https://cdn.shopify.com/s/files/1/0434/5213/7622/files/cbse_class_12_accountancy_sample_paper_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/4969/7959/files/55177494208.pdf
    • https://cdn.shopify.com/s/files/1/0433/4711/6197/files/nupedusufawimomofikejaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8723/files/20160544732.pdf
    • https://cdn.shopify.com/s/files/1/0430/0328/1571/files/araby_summary.pdf
    • https://cdn.shopify.com/s/files/1/0451/4234/3834/files/scratch_basic_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0428/7086/6087/files/ligamitipomi.pdf
    • https://cdn.shopify.com/s/files/1/0459/2192/7319/files/buxuxewesed.pdf
    • https://cdn.shopify.com/s/files/1/0434/0642/6275/files/hershey_Schokolade-Torte_Rezept_einf.pdf
    • https://cdn.shopify.com/s/files/1/0438/7943/2347/files/37498452267.pdf
    • https://cdn.shopify.com/s/files/1/0430/4614/2114/files/xufijelanipi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0818/files/calvinismo_e_arminianismo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3296/0409/files/33487378433.pdf
    • https://cdn.shopify.com/s/files/1/0432/4379/8683/files/effective_communication_questions.pdf
    • https://cdn.shopify.com/s/files/1/0433/9784/1054/files/99195742845.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068b7.bin
8144cc52217e8065d0d0ee8a93794adefda71663ca6e6b7f815b1aa6b61aeaf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68B7 5312 bytes
font_01_sfnt_off00007aa6.bin
1b86d79176f2d2e4d2053ec7427b600c2d645ff743f9b1cb17e0cc959fe40623		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA6 9996 bytes
font_02_sfnt_off00009cd5.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CD5 4324 bytes

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