Malicious PDF — malware analysis report

Static analysis result for SHA-256 3521a0c6f98434a8…

MALICIOUS

PDF

55.6 KB Created: 2020-08-11 03:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fab31d82609d8326ae23233866082e3c SHA-1: f148665c937dfcb8d049c8d6bcf6911b3a816920 SHA-256: 3521a0c6f98434a82667ec738d092d59ca08439b2bca3af5b76204059ed2cf0f
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a 'PDF SEO Link Farm'. The primary malicious URL identified is https://ttraff.com/pify?keyword=riessman+narrative+analysis+pdf, which is flagged as a known malicious redirector. This suggests the document's purpose is to lure users into clicking these links, leading them to potentially harmful destinations.

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=riessman+narrative+analysis+pdf
    • http://files.pearlywhitespediatricdentistry.com/uploads/1/3/1/6/131637257/2982995.pdf
    • http://files.bankslawyers.com/uploads/1/3/1/4/131406649/marulosavepoxomoki.pdf
    • http://files.burrowsmemorial.org/uploads/1/3/1/0/131071164/rosivawuloriw-waxujoboreg.pdf
    • http://resaxedi.shannonlegrand.com/uploads/1/3/1/4/131437423/bejabimar.pdf
    • http://files.waindustrialsupplies.net/uploads/1/3/1/1/131163867/17bd03.pdf
    • https://cdn.shopify.com/s/files/1/0433/4324/9563/files/57046774469.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupesuditijativerawepafu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84511803825.pdf
    • https://cdn.shopify.com/s/files/1/0431/5312/9640/files/41093428544.pdf
    • https://cdn.shopify.com/s/files/1/0437/3456/5025/files/86088763461.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3263/files/loketidezurumum.pdf
    • https://cdn.shopify.com/s/files/1/0433/3826/8827/files/kivavaxokovoluzejitifoga.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/apstolos_augustus_nicodemus.pdf
    • https://cdn.shopify.com/s/files/1/0431/2314/6906/files/carb_cycling_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0438/8998/3643/files/51206149401.pdf
    • https://cdn.shopify.com/s/files/1/0432/8062/9913/files/abstract_reasoning_test_for_grade_1.pdf
    • https://cdn.shopify.com/s/files/1/0454/7385/7686/files/area_of_different_shapes_formula.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_off00009888.bin
588e5a58695309cbf938d29db9122a50c2f13e6ddb67f1679c8ca85a2556bca5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9888 5356 bytes
font_01_sfnt_off0000aab3.bin
395c945c0738f87ab37ee5bf8e3009c4987ce02bbfb160a3855cb32add993ea8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAB3 11364 bytes

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