Malicious PDF — malware analysis report

Static analysis result for SHA-256 2acc37d0e60ebe64…

MALICIOUS

PDF

62.7 KB Created: 2020-08-17 02:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17620a74685d95dbffe1099792781a11 SHA-1: ddcd7260740f0ef7e0df39ac51c434dd5e613068 SHA-256: 2acc37d0e60ebe64c9189ae4adfc579e84fc7053a764be5fab468a4e6f90acd3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'psat practice test 1 spring 2019 answers' and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be a link farm designed to redirect users to malicious infrastructure.

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=psat+practice+test+1+spring+2019+answers
    • http://files.plant-miner.com/uploads/1/3/1/3/131379833/9735485.pdf
    • http://files.foe2122.com/uploads/1/3/0/7/130739718/gonoguguzedafumetopi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/questions_and_answers_about_vietnam_war.pdf
    • https://cdn.shopify.com/s/files/1/0429/7405/2503/files/vogojenukizeriwino.pdf
    • https://cdn.shopify.com/s/files/1/0427/4801/8855/files/lewis_sperry_chafer_systematic_theology.pdf
    • https://cdn.shopify.com/s/files/1/0431/4995/1138/files/7352221845.pdf
    • https://cdn.shopify.com/s/files/1/0437/2371/8805/files/30636493569.pdf
    • https://cdn.shopify.com/s/files/1/0437/6631/7205/files/calculus_1_exam.pdf
    • https://cdn.shopify.com/s/files/1/0437/1175/8504/files/jumatabo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5865/8454/files/femuzeriripoxavixusurun.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/24927025942.pdf
    • https://cdn.shopify.com/s/files/1/0433/6589/2264/files/61804251130.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c23.bin
1e47d860ae4b0f041a81a6a56b04361a4e3a558e53e6dcc71132f57a2b7472d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C23 7736 bytes
font_01_sfnt_off00009040.bin
f1eab49ef09ed228f475743da417a3add55936e5bc8dbf5065690bbade6714c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9040 5644 bytes
font_02_sfnt_off0000a39d.bin
8bc4ed4995c95f541df75b2bce7110c4fdd53b4c1521ef2d66ed2c5cfce12bde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA39D 16772 bytes
font_03_sfnt_off0000d839.bin
e35eccadac00179dbe2e3b006bf53272e2d1b8c783dbea328c5e4da005a83383		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD839 16100 bytes

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