Malicious PDF — malware analysis report

Static analysis result for SHA-256 8edf3a11717c191b…

MALICIOUS

PDF

44.4 KB Created: 2020-08-30 06:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24c81a02e63bb9a511e972edd03aaa27 SHA-1: 2237925b7c3f8aa60105cf937069b79b830fde1a SHA-256: 8edf3a11717c191b0b84c936a5cb139712cdaeb3ac07c388d3184e96eba40a0c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link redirects to a known malicious domain. The document body, though heavily obfuscated, contains text related to 'Beatles fake book pdf' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly indicates 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.com/wix?keyword=beatles+fake+book+pdf
    • https://cdn.shopify.com/s/files/1/0428/5644/8167/files/vefonebaguwasezubi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1126/0062/files/bpsc_online_apply_form.pdf
    • https://cdn.shopify.com/s/files/1/0440/8298/7158/files/48864606933.pdf
    • https://cdn.shopify.com/s/files/1/0432/1368/4891/files/67541925337.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/68965591556.pdf
    • https://static.usrfiles.com/ugd/c20ea7_32b0f992ff1945ee88e8299c53f66954.pdf
    • https://static.usrfiles.com/ugd/b8c837_f62fa2c5847546c7a0229e23673290ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_59576f33e5104edd9ab1cbd62367a1f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f875d4407444259a3dbeb4d55c5e712.pdf
    • https://cdn.shopify.com/s/files/1/0439/4146/2174/files/biomechanics_of_sport_and_exercise_3rd_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0088/8469/files/raxatu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9103/3250/files/85601739660.pdf
    • https://cdn.shopify.com/s/files/1/0466/7752/4645/files/veterinary_pathology_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/5982/2243/files/interim_reporting_requirements.pdf
    • https://static.usrfiles.com/ugd/10b11f_43fc21e61b0d4146919e1a1924722973.pdf
    • https://static.usrfiles.com/ugd/a59130_17cf7bcdb75a4c6b9ea362a5e22164a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_7b3a33a4800b4cea812f1c5700f60698.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_off000062d5.bin
080eb22ab732dd040758934ca20bb77ac6b62e5ed2d79ee08c5ced5d6bda2909		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D5 4828 bytes
font_01_sfnt_off00007349.bin
b60725ecae396a3cfa4b2ae42860f6f4e1e4c0fc86a710aac7161d72b7296a45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7349 10240 bytes
font_02_sfnt_off00009660.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9660 4324 bytes

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