Malicious PDF — malware analysis report

Static analysis result for SHA-256 7caadd0c6a4345f0…

MALICIOUS

PDF

38.6 KB Created: 2020-08-21 18:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa2861dbf7f336dbc622226c48e60da8 SHA-1: 91e7302519bdf7353b65664bed243c9197fff92d SHA-256: 7caadd0c6a4345f0233a8aa3adf41282a1ad9c0efe717c6609356444bf208811
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a 'handover letter' and includes the malicious URL, suggesting a social engineering lure. The presence of numerous PDF links, many pointing to Shopify, indicates a link farm designed to obscure the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=handover+letter+format+after+resignation+template
    • http://nafixidu.nolaclay.org/uploads/1/3/0/7/130738909/rawojibo-rezixulofo-gipufegivave.pdf
    • http://tuxulige.mrstruitt.net/uploads/1/3/2/3/132302780/436f5cadb0c.pdf
    • http://files.lynnobrienmusic.com/uploads/1/3/1/4/131437308/36cbcf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3624/4118/files/convert_to_word_using_zamzar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gidawibozifuniji.pdf
    • https://cdn.shopify.com/s/files/1/0437/5330/8314/files/poultry_diseases_and_their_treatment_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2765/9932/files/effect_of_water_pollution_on_human_life.pdf
    • https://cdn.shopify.com/s/files/1/0432/8728/1832/files/dawuwuvajivibuzosekeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/86308326659.pdf
    • https://cdn.shopify.com/s/files/1/0437/3633/4501/files/31281388676.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/59945905636.pdf
    • https://cdn.shopify.com/s/files/1/0447/3772/4572/files/new_english_action_movies_2017_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/3400/2086/files/52238651833.pdf
    • https://cdn.shopify.com/s/files/1/0435/3612/2008/files/82600061724.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a4d.bin
d75635639d251f50d26dbf66beb477d970f4bac0b150d3525d55135155ef8c3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A4D 5384 bytes
font_01_sfnt_off00006c8c.bin
01108f9aa0349972987cf0daabe80b85898f79fb2927964aa1ba7b20fa69e4f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C8C 9660 bytes

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