Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a25f7d0e8cafdb…

MALICIOUS

PDF

51.9 KB Created: 2020-08-06 07:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c74eb6869db5a2be3140c9b3e78b2890 SHA-1: d26733940a40ded70bcd6a08e8a758a52e74a69d SHA-256: a8a25f7d0e8cafdba72b8692123f4b0a2dac540dacbe4f6e09dd12991d2493ce
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is part of a link farm designed to distribute malicious content. The document body, though heavily obfuscated, contains text related to 'English to tamil conversation book pdf' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of multiple Shopify URLs, some benign and some unknown, indicates an attempt to blend malicious links with seemingly legitimate ones.

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.ru/pify?keyword=english+to+tamil+conversation+book+pdf
    • http://files.malvernehistory.org/uploads/1/3/0/7/130775490/603dbcbf8.pdf
    • http://files.singingsawpress.com/uploads/1/3/0/7/130776326/pisosodira.pdf
    • http://files.mikaylamac.com/uploads/1/3/1/0/131069992/nogek_fokozukunajeb.pdf
    • http://files.elliemartino.com/uploads/1/3/2/6/132681488/rojuvibutol.pdf
    • http://files.thebodyshop82633.com/uploads/1/3/1/8/131871704/lesetebaritogokemul.pdf
    • https://cdn.shopify.com/s/files/1/0440/6332/6358/files/uninstall_microsoft_teams.pdf
    • https://cdn.shopify.com/s/files/1/0430/4342/2359/files/tovuvibilumawurovoti.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/97321553459.pdf
    • https://cdn.shopify.com/s/files/1/0429/1071/1971/files/nikagagejepapizikefevexiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61259485886.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xugifewelogukepebokiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/0426/4602/files/3472423411.pdf
    • https://cdn.shopify.com/s/files/1/0428/2001/0140/files/nursing_drug_handbook_2017.pdf
    • https://cdn.shopify.com/s/files/1/0431/6413/9674/files/2758545646.pdf
    • https://cdn.shopify.com/s/files/1/0441/0382/7608/files/aiou_b._ed_admission_form_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/5520/8858/files/63490661001.pdf
    • https://cdn.shopify.com/s/files/1/0429/0671/4268/files/rws_model_34.pdf
    • https://cdn.shopify.com/s/files/1/0432/9301/6222/files/dujaxunaw.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b07.bin
f973b32cf51a01bbd76c654176f40446e5dcf4d6ef210df4c9d77739b77c8925		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B07 5580 bytes
font_01_sfnt_off00006dca.bin
914ea79bf6b97de2ebb314ca017559fc7e3bff4748c11b12e1fd026b57cc11c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DCA 9876 bytes
font_02_sfnt_off0000877d.bin
98e3357879e208726cd32bc05e916e339afa8ce39000fba1ef8e94e44d0a255a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x877D 14172 bytes
font_03_sfnt_off0000b3bd.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BD 4324 bytes

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