Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f4113e93b2efdb…

MALICIOUS

PDF

45.4 KB Created: 2020-08-22 17:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3157d0060484b51b821b001f34f53291 SHA-1: 5297dbc10533e8b6ff30cce900be0016df693065 SHA-256: 79f4113e93b2efdbeaaf6f0de250103faf49c26a5a45adb21b7d186021d3b9a6
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged the PDF as malicious. While no scripts were directly extracted, the presence of numerous external links, including one pointing to a known malicious redirector, suggests an attempt to lure users to malicious sites or engage in SEO manipulation. The document body contains garbled text and URLs, further supporting a malicious intent.

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.cc/pify?keyword=android+bottom+navigation+view+remove+animation
    • http://files.sedatedmedical.com/uploads/1/3/2/8/132815004/garejefubufalin.pdf
    • http://bovila.beurownreligion.com/uploads/1/3/2/6/132682883/baxibufujo.pdf
    • http://files.scfsoftballclub.com/uploads/1/3/1/4/131454567/237483.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3616/3747/files/22099701595.pdf
    • https://cdn.shopify.com/s/files/1/0437/6992/1688/files/samsung_j200g_frp_bypass_apk.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/61121295968.pdf
    • https://cdn.shopify.com/s/files/1/0434/2156/5078/files/organic_chemistry_fourth_edition_janice_smith.pdf
    • https://cdn.shopify.com/s/files/1/0427/9848/1564/files/80734050865.pdf
    • https://cdn.shopify.com/s/files/1/0430/3428/0090/files/37549498516.pdf
    • https://cdn.shopify.com/s/files/1/0435/8189/8913/files/88366486031.pdf
    • https://cdn.shopify.com/s/files/1/0440/8262/6710/files/dojetimitazokoviz.pdf
    • https://cdn.shopify.com/s/files/1/0437/2905/9991/files/sherlock_holmes_by_sir_arthur_conan_doyle.pdf
    • https://cdn.shopify.com/s/files/1/0438/0177/2192/files/nofubewenusagufezilut.pdf
    • https://cdn.shopify.com/s/files/1/0445/4852/2143/files/jalixiji.pdf
    • https://cdn.shopify.com/s/files/1/0433/6680/9765/files/order_of_adjectives_exercises_with_answers.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000743d.bin
c0346a74fc2d77f478bee8d588d5e0eba3e8a69a88f3b3c27884ceeae24a9ed1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x743D 5216 bytes
font_01_sfnt_off000085f5.bin
32af439baae0995fe3644bc4663e017a6ff314b3fc57b75fad3cbccf951ac7a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85F5 10128 bytes

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