Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb28e7281834d27…

MALICIOUS

PDF

37.4 KB Created: 2020-08-14 07:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce651066afb722c03a2bc588f3c61895 SHA-1: cb20ddb6df4897ae13e19e02b6249343d69a92a0 SHA-256: 7bb28e7281834d272639def7e2a372db05617aed2c0ec39a27005cd9893d2d80
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, appears to contain text related to a product manual, likely serving as a lure. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful sites.

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/wb?keyword=masterbuilt%20propane%20smoker%20owner
    • http://files.henricobar.org/uploads/1/3/1/3/131381422/wodutifu.pdf
    • http://files.saphotoservices.com/uploads/1/3/2/3/132303322/moditenekij.pdf
    • http://files.hubbellbros.com/uploads/1/3/1/4/131453256/zuzavuwat_banim_naxepe_japirafibo.pdf
    • http://files.nadinebertalli.com.au/uploads/1/3/1/4/131483097/259070.pdf
    • https://cdn.shopify.com/s/files/1/0437/1460/9305/files/xukoxaxigu.pdf
    • https://cdn.shopify.com/s/files/1/0436/2731/5353/files/throw_exception_java.pdf
    • https://cdn.shopify.com/s/files/1/0430/9726/0192/files/42432603533.pdf
    • https://cdn.shopify.com/s/files/1/0434/6006/7480/files/67278893811.pdf
    • https://cdn.shopify.com/s/files/1/0432/7600/9622/files/centralizer_of_a_group.pdf
    • https://cdn.shopify.com/s/files/1/0434/1517/5317/files/branchement_interrupteur_va_et_vient_en_simple_allumage.pdf
    • https://cdn.shopify.com/s/files/1/0433/2224/5273/files/microstrip_array_antenna.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/zutilexusikiziv.pdf
    • https://cdn.shopify.com/s/files/1/0436/8783/7849/files/caligula_camus.pdf
    • https://cdn.shopify.com/s/files/1/0440/5841/1158/files/occupational_safety_and_health_for_rrb_alp_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/8251/3574/files/pfaff_industrial_sewing_machine.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/files/1/0440/5841/1158/files/occupational_safety_and_health_for_rrb_alp_

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004850.bin
4a38122625a7f3a5563bfd5a99616e48b30da8bb743ab46a6440535dfc5c7c40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4850 5180 bytes
font_01_sfnt_off000059e0.bin
2e60e835e06995749f1b01d202926fb33b344d1b50c8826b5af86bac4fe9af78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59E0 9536 bytes
font_02_sfnt_off00007a5e.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A5E 4324 bytes

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