Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a0da8973494bd5…

MALICIOUS

PDF

39.0 KB Created: 2020-08-15 01:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cabe377e86c21852bfc8e7808ad71745 SHA-1: 716c55590d4c0479686c27a9574c522debce3393 SHA-256: 38a0da8973494bd5cfeb15b3818b8219c87eaa0872dda351d66a505cbfe093d7
152 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, with the primary link pointing to a known malicious redirector. This suggests the document is designed to lure users to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=fishing+planet+ps4+emerald+lake+guide
    • http://kadowisul.glyphs.org/uploads/1/3/0/9/130969754/a4153049ef.pdf
    • http://files.syracusesheds.com/uploads/1/3/1/3/131383619/857cf.pdf
    • https://cdn.shopify.com/s/files/1/0429/2549/0332/files/96031684772.pdf
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/gifiga.pdf
    • https://cdn.shopify.com/s/files/1/0434/8307/0629/files/panenoki.pdf
    • https://cdn.shopify.com/s/files/1/0448/9605/9547/files/biology_class_11_chapter_2_ncert_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0430/9159/1317/files/fedadakoziwudupapovo.pdf
    • https://cdn.shopify.com/s/files/1/0429/1539/7788/files/11959296243.pdf
    • https://cdn.shopify.com/s/files/1/0435/6761/2065/files/ccna_200_120_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/0737/7561/files/2579215571.pdf
    • https://cdn.shopify.com/s/files/1/0434/1540/4711/files/bigej.pdf
    • https://cdn.shopify.com/s/files/1/0431/1272/6677/files/example_of_official_letter.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_off00005901.bin
49163de9eeebc7207526460c2a86b4a9fc1e35ea9a87e5b869818a5ec9f694ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5901 5480 bytes
font_01_sfnt_off00006b76.bin
48664d39b81a735b0cf3adca9b040426d7502dd4f44d57f36a3001ecb1f6a13c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B76 10532 bytes

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