Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe02e7f31d9395fb…

MALICIOUS

PDF

39.6 KB Created: 2020-08-23 03:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26ad1a5438f3a74814f838d58c5c3168 SHA-1: ddeeefae44a911299999f506fad4990800a6725c SHA-256: fe02e7f31d9395fb65898d4ce7cbb970b2f3f967fd89ba00cfedf71f9346281e
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The presence of a large link farm suggests an attempt to manipulate search engine results or direct users to potentially harmful content. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of specific user lures.

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/pify?keyword=passage+to+abstract+mathematics+pdf
    • http://files.colossalsportsent.com/uploads/1/3/0/7/130739021/rofuwot-xunepowupububuz.pdf
    • http://bijuzib.theschoolofrevival.org/uploads/1/3/1/3/131382134/zofizox-gefanaroxafuxik.pdf
    • http://files.sbkliquidators.com/uploads/1/3/0/7/130739510/duwovaratinozeb_lejozewujin.pdf
    • http://files.organicpositivity.com/uploads/1/3/0/7/130775002/tusavub.pdf
    • https://cdn.shopify.com/s/files/1/0431/7659/1509/files/tegorekegefekaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/zumadavuguzugolarobed.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/komovesubagotafijuviviz.pdf
    • https://cdn.shopify.com/s/files/1/0430/9526/1348/files/97582907385.pdf
    • https://cdn.shopify.com/s/files/1/0431/4575/6833/files/wilagijukini.pdf
    • https://cdn.shopify.com/s/files/1/0433/8617/5651/files/tim_keller_every_good_endeavor.pdf
    • https://cdn.shopify.com/s/files/1/0437/1916/4058/files/worthington_dinner_roast_nutritional_information.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5347/files/libros_apocrifos_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0434/9784/8996/files/82235688170.pdf
    • https://cdn.shopify.com/s/files/1/0429/8915/8554/files/88756173973.pdf
    • https://cdn.shopify.com/s/files/1/0454/7146/5630/files/barmeno_bold_free_font.pdf
    • https://cdn.shopify.com/s/files/1/0430/7098/0247/files/nujurisuwigojepigubip.pdf
    • https://cdn.shopify.com/s/files/1/0438/3319/6706/files/pawiduwiwara.pdf
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/sobomasipezitarojabe.pdf
    • https://cdn.shopify.com/s/files/1/0439/4074/1275/files/bootstrap_button_submit_form_post.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/1/0438/8470/7992/files/sobomasipezitarojabe.pd

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ac4.bin
aeac5f999471a4b7e4bbff338c21d9afb69f725c4bd6cac9d382dfa8c789e396		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC4 5676 bytes
font_01_sfnt_off00006de3.bin
a26bdaf5d004420bb633c4ff0a9ec03fbf46c2b0ec032b90c2b2551c976427a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE3 10440 bytes

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