Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c198e760fe01dd…

MALICIOUS

PDF

50.7 KB Created: 2020-09-04 00:40:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35b07471cae7a9970b64706dc608acbb SHA-1: bfa65636fc39af45a2c8eac2c8a4cc2c17c62b13 SHA-256: e6c198e760fe01dde16fd44cebf7934883b37011e87bfab5dc4092c8d22014b5
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a redirector to a known malicious infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/wix?keyword=transcription+and+translation+worksheet+biology, suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness. The presence of a link farm and a malicious redirector points to a phishing or malware distribution attempt.

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/wix?keyword=transcription+and+translation+worksheet+biology
    • https://cdn.shopify.com/s/files/1/0429/2021/4681/files/88039704291.pdf
    • https://cdn.shopify.com/s/files/1/0431/2976/6039/files/16160665655.pdf
    • https://cdn.shopify.com/s/files/1/0439/3422/0456/files/91238077357.pdf
    • https://cdn.shopify.com/s/files/1/0447/9657/5904/files/14787633928.pdf
    • https://cdn.shopify.com/s/files/1/0430/9732/5732/files/resisting_happiness_matthew_kelly.pdf
    • https://static.usrfiles.com/ugd/bf57b5_1fc718e55bc0470c90a0e89bb1b0507e.pdf
    • https://static.usrfiles.com/ugd/2486b5_6db1080dd06247f0a70a4b7ea8fb0945.pdf
    • https://static.usrfiles.com/ugd/238140_0c01be0a973247eba0537d5d64c1d15c.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b6d999c51a34c7996ee9ac66540983d.pdf
    • https://static.usrfiles.com/ugd/29c71c_a7fdb5b25f544e44b87e330485181553.pdf
    • https://cdn.shopify.com/s/files/1/0457/9200/2204/files/phonetic_alphabet_printable.pdf
    • https://cdn.shopify.com/s/files/1/0433/8050/6773/files/kodiak_annual_weather_report.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/90419995731.pdf
    • https://cdn.shopify.com/s/files/1/0463/1838/7362/files/prepositional_phrase_as_adjective_and_adverb_worksheet.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/
    • https://static.usrfiles.com/ugd/238140_0c01be0a973247eba0537d

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006421.bin
a027c19604dc9dd422ceab7b98aa182038133b6d5c49ecb1a04df98f433e48e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6421 5468 bytes
font_01_sfnt_off000076b5.bin
180c7f7e6c532e7cdfe7c20b54876d4e1fe6b0c2403630f5aa3e605e0338085c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76B5 10140 bytes
font_02_sfnt_off0000998f.bin
31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x998F 16204 bytes
font_03_sfnt_off0000aebd.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBD 4324 bytes

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