Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a26c8c99df39b1…

MALICIOUS

PDF

44.4 KB Created: 2020-08-16 21:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c72e00849fdf6afbfb2b50a29a03c34 SHA-1: 5b8d48bb15a29997d2e3664408afad1044155868 SHA-256: a4a26c8c99df39b1006ddec2267463a0a8c7c3ff07f12acc96150d8cb8146d34
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.ru/pify?keyword=accident+report+detail+osha, is identified as a known malicious redirector. The document body, though heavily obfuscated, contains the same lure text and URLs. This suggests the PDF is designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

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=accident+report+detail+osha
    • http://zigadokuf.nbsccromercampusscience.com/uploads/1/3/0/7/130775540/5258380.pdf
    • http://voxebokup.kimatdesigns.com/uploads/1/3/2/8/132815986/volizusalufebufinod.pdf
    • http://gilog.cindyalewis.com/uploads/1/3/0/8/130814017/702a46212.pdf
    • http://files.tinacranfield.co.uk/uploads/1/3/0/7/130775958/466715323.pdf
    • http://files.gacstop.com/uploads/1/3/0/7/130776343/d1b6be8d5fd1117.pdf
    • https://cdn.shopify.com/s/files/1/0434/1130/8696/files/javezi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3762/files/42019593834.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/haloalkanes_and_haloarenes_class_12_notes_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/3333/7768/files/vonetogawaritatenabamaje.pdf
    • https://cdn.shopify.com/s/files/1/0437/5412/7521/files/javascript_remove_object_from_array.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/wivuze.pdf
    • https://cdn.shopify.com/s/files/1/0436/1604/3168/files/7624478055.pdf
    • https://cdn.shopify.com/s/files/1/0434/9411/3446/files/real_estate_finance_and_investments_brueggeman.pdf
    • https://cdn.shopify.com/s/files/1/0437/5180/0981/files/fizopukan.pdf
    • https://cdn.shopify.com/s/files/1/0431/9707/1524/files/zopadiseratagagenokojixej.pdf
    • https://cdn.shopify.com/s/files/1/0428/4183/3635/files/sisaxosikawik.pdf
    • https://cdn.shopify.com/s/files/1/0432/0775/3888/files/17477059692.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_off00006e8f.bin
066adb061f130e2fcd0d24b9a5993a7fe11ae9cce067fd20513dce9794f41177		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8F 5152 bytes
font_01_sfnt_off00007ff6.bin
7441951672e135915072da6a2228f54db8587b3839cc397586b81473ccf1c0e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF6 10736 bytes

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