Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e241a172269bec7…

MALICIOUS

PDF

50.1 KB Created: 2020-08-16 21:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f80d7a563def3479224cb3011e1330f5 SHA-1: 4cfc67e6bc492f09b2ed3652e24259971bfdb227 SHA-256: 3e241a172269bec7ed074c501672a17ac866e3b5c59bfc585b7577d7233c8416
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic identified a PDF link to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=ester+formation+from+carboxylic+acid+and+alcohol'. Another critical heuristic indicates a PDF link farm, with many links pointing to shopify.com domains, suggesting an attempt to obscure the true malicious destination. The document body itself is heavily obfuscated but contains the same redirector URL.

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=ester+formation+from+carboxylic+acid+and+alcohol
    • http://jetarur.alkhomassia.com/uploads/1/3/0/8/130814328/2112071.pdf
    • https://cdn.shopify.com/s/files/1/0433/5802/7928/files/zulakis.pdf
    • https://cdn.shopify.com/s/files/1/0429/0412/5599/files/3872062150.pdf
    • https://cdn.shopify.com/s/files/1/0438/1795/9586/files/5000_frases_en_ingles.pdf
    • https://cdn.shopify.com/s/files/1/0429/8797/8913/files/mandibular_nerve_block_technique.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/99529223578.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9957/files/lawobokabiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/4031/7335/files/2127523723.pdf
    • https://cdn.shopify.com/s/files/1/0438/3516/2784/files/15501119993.pdf
    • https://cdn.shopify.com/s/files/1/0433/3296/0409/files/facilities_and_equipment_of_arnis.pdf
    • https://cdn.shopify.com/s/files/1/0431/0332/2269/files/botswana_map_showing_villages.pdf
    • https://cdn.shopify.com/s/files/1/0432/1142/3902/files/arraylist_set_method.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_off0000635d.bin
4c271f0d9829480e4faba3a199b862f97e77671c408fed24b7a01ed64ff5b5fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x635D 5316 bytes
font_01_sfnt_off0000753b.bin
4249f035a6f24048b272b8a22039961b1d74e24ef005477250be93f778958956		 pdf-font-stream PDF embedded font (sfnt) at offset 0x753B 10076 bytes
font_02_sfnt_off000097e1.bin
9bff4e6d7f8cbe2dc7292347b18f75d0d8e6bccc0e080da3143d66f69ef3d0e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97E1 16116 bytes
font_03_sfnt_off0000acbc.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACBC 4324 bytes

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