Malicious PDF — malware analysis report

Static analysis result for SHA-256 49637b58c4867221…

MALICIOUS

PDF

60.8 KB Created: 2020-08-12 14:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfd1fa46f56a0c785884d4dc85a6a751 SHA-1: fd5804150f01274be44bf07ef47600036e9a6889 SHA-256: 49637b58c48672215b6b8944dd1ddb0b1ac7604e2cdf9be34d43a5e0feffdaab
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. This URL is embedded within the document body, disguised as a link to 'equivalent fractions worksheets 5th grade pdf'. The PDF also exhibits characteristics of a link farm, with numerous external links, many hosted on cdn.shopify.com, suggesting an attempt to distribute malicious content or engage in SEO abuse. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=equivalent+fractions+worksheets+5th+grade+pdf
    • http://files.allaboutyoufitnessbyjamie-dee.com/uploads/1/3/0/8/130814644/loxunirawowuj-forusizo.pdf
    • http://files.bebeautybylisa.nl/uploads/1/3/0/7/130739143/gidebukelujopenogo.pdf
    • http://rutiru.drtmobilevetcare.com/uploads/1/3/0/9/130969953/vesiwajefif.pdf
    • http://zemuzovug.chest-messages.com/uploads/1/3/2/6/132680813/zajapexepelagumadoj.pdf
    • https://cdn.shopify.com/s/files/1/0436/9471/9131/files/wimajeku.pdf
    • https://cdn.shopify.com/s/files/1/0434/2906/8949/files/murivunufutodazodubepibo.pdf
    • https://cdn.shopify.com/s/files/1/0428/0667/3575/files/breasted_history_of_egypt.pdf
    • https://cdn.shopify.com/s/files/1/0430/9558/9013/files/63005525456.pdf
    • https://cdn.shopify.com/s/files/1/0436/0385/3476/files/25148936456.pdf
    • https://cdn.shopify.com/s/files/1/0429/9217/3217/files/medical_english_esl.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9933/files/bakuvelazibo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1467/4841/files/79095010601.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84312174386.pdf
    • https://cdn.shopify.com/s/files/1/0430/0426/4602/files/91671274774.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6820/files/24823191784.pdf
    • https://cdn.shopify.com/s/files/1/0433/9728/3992/files/basic_c_programs_for_practice.pdf
    • https://cdn.shopify.com/s/files/1/0433/8368/5274/files/91048532721.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://cdn.shopify.com/s/fil

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008d15.bin
c64112ceebaa70ae90a008679268ae5fb058f6990b732f2256fa2e595f73306b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D15 5724 bytes
font_01_sfnt_off0000a09f.bin
744c36ecdee2253eb25184e493f302501458394c5218aa50a9d180020972ede3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA09F 9712 bytes
font_02_sfnt_off0000c21f.bin
edc33fe94617b35fa5734827a91efdc9665031ac3a5a8b8018a6396f4204b3d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC21F 16116 bytes
font_03_sfnt_off0000d6f7.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F7 4324 bytes

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