Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af141ef55fd1e74…

MALICIOUS

PDF

42.3 KB Created: 2020-08-07 06:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5627821aef0d35969bcbcf80a053ab0 SHA-1: eeb6ee37fb9917e8bd305f4cf9116723d89cb7b0 SHA-256: 7af141ef55fd1e7441da5afe9dd3b8c20459730744d89ec873a320612efc6fe6
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is designed to lure users into downloading further malicious content. The document body, though heavily obfuscated, contains text related to 'renewable energy sources mcq pdf' and the malicious URL itself, suggesting a phishing or social engineering lure. The presence of numerous external PDF links, many hosted on Shopify, further indicates a link farm or redirection strategy.

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=renewable+energy+sources+mcq+pdf
    • http://files.fuserealtyhomes.ca/uploads/1/3/1/4/131453695/7769f2190.pdf
    • http://wisogoja.lakesmogtest.com/uploads/1/3/2/7/132740978/dbd189bdaab69.pdf
    • http://files.adelaide-pilates.com/uploads/1/3/0/7/130739761/zijupepojumoviziwese.pdf
    • http://files.nickjagger.org/uploads/1/3/0/8/130813639/4d890949633.pdf
    • https://cdn.shopify.com/s/files/1/0438/1540/3682/files/35274805739.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6849/files/bioreactors_for_animal_cell_culture.pdf
    • https://cdn.shopify.com/s/files/1/0431/3281/3473/files/pasope.pdf
    • https://cdn.shopify.com/s/files/1/0431/8553/7175/files/2300404947.pdf
    • https://cdn.shopify.com/s/files/1/0434/2733/2252/files/70663204733.pdf
    • https://cdn.shopify.com/s/files/1/0440/8098/8325/files/frost_mage_artifact.pdf
    • https://cdn.shopify.com/s/files/1/0437/1510/0822/files/6389190122.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2328/files/72278360482.pdf
    • https://cdn.shopify.com/s/files/1/0433/5419/4085/files/muvut.pdf
    • https://cdn.shopify.com/s/files/1/0430/8362/8697/files/medar.pdf
    • https://cdn.shopify.com/s/files/1/0434/8480/7334/files/great_writing_4_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6248/files/bitadujimuvapusamop.pdf
    • https://cdn.shopify.com/s/files/1/0429/7211/9193/files/2001_honda_civic_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/2065/6545/files/posewivipuresipagudijafan.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_off0000650e.bin
40fc5a4bb86af8bfcc25282ce1188c2c0219da9ade031cfd73b3a3b981241b9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x650E 5944 bytes
font_01_sfnt_off00007943.bin
190b42a8098b1edd23c26688790d67f81e0e1dc13f687394af1f1235a46b7409		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7943 10376 bytes

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