Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd95aa621143966…

MALICIOUS

PDF

46.6 KB Created: 2020-08-20 00:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8199666edc802d85504c5663b645d33 SHA-1: 66193054f25b3e82782ad519568d26487ef75104 SHA-256: 8fd95aa62114396683d4d2660614ba8da2df964f4eae9402af9282b2ccf3bf3b
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including a critical link to a known malicious redirector at 'ttraff.ru'. The document body, though partially obfuscated, suggests a lure related to TOEFL writing samples, aiming to trick users into clicking the malicious link. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the primary attack vector appears to be a link-based redirection 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=toefl+writing+task+1+sample+answers
    • http://files.cvhsmusicals.org/uploads/1/3/1/4/131452804/406d9.pdf
    • http://gugajomew.rodneycassarphotography.com/uploads/1/3/2/6/132681670/5447515.pdf
    • http://paduwugi.game.myworldrules.com/uploads/1/3/1/4/131438800/643ea635e.pdf
    • http://files.thorsonpto.org/uploads/1/3/1/3/131398177/keruwupobodile_sofadarojek.pdf
    • https://cdn.shopify.com/s/files/1/0435/3762/9348/files/91173506911.pdf
    • https://cdn.shopify.com/s/files/1/0429/1421/8143/files/ruvujipetubavineforikik.pdf
    • https://cdn.shopify.com/s/files/1/0434/2913/4501/files/luwepudivewavuwowolu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9960/9505/files/definicion_de_amistad_segun_autores.pdf
    • https://cdn.shopify.com/s/files/1/0459/2451/5989/files/benchmark_para_pc.pdf
    • https://cdn.shopify.com/s/files/1/0431/5506/2938/files/merosib.pdf
    • https://cdn.shopify.com/s/files/1/0437/6307/3181/files/78117297225.pdf
    • https://cdn.shopify.com/s/files/1/0432/3452/5352/files/business_report_example_word.pdf
    • https://cdn.shopify.com/s/files/1/0434/0344/4387/files/92334760624.pdf
    • https://cdn.shopify.com/s/files/1/0434/4738/6268/files/25609565304.pdf
    • https://cdn.shopify.com/s/files/1/0437/2915/8295/files/memimoxipoditeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/78351644422.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a9c.bin
d045e02da159a67d4462203b85b3db7739c4c6f1fefe4a9247fa279ef11a8b29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A9C 5164 bytes
font_01_sfnt_off00007c34.bin
d83e69f9fe07743136e219237975f4129ab41d347f98d0fec0e56536028294ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C34 10332 bytes
font_02_sfnt_off00009f77.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F77 4324 bytes

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