Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6bd76f1b31f8312…

MALICIOUS

PDF

48.9 KB Created: 2020-08-02 04:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfa19554d5805be556364f94e7937036 SHA-1: bd02497d50b3966ca5d7ad5086962b709ad88fa8 SHA-256: c6bd76f1b31f83123b8238b9af8562a9f45b626e701b3d2d9de5fdf72b72b0d6
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic identified links to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=background+color+opacity'. Another critical heuristic noted a large number of external PDF links, many hosted on cdn.shopify.com, suggesting a link farm or SEO poisoning tactic. The document body itself is largely unreadable binary data, but the embedded links are the primary indicators of malicious intent.

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=background+color+opacity
    • http://files.alburghschool.org/uploads/1/3/0/9/130969831/vovidiwe.pdf
    • http://files.ctisports.com/uploads/1/3/0/7/130740477/f101b4c76fad4.pdf
    • http://files.carolynwagnerdesign.com/uploads/1/3/1/0/131070846/lidagozutatot-zerananebet-domoverir-zaravufapefi.pdf
    • http://files.seasonstravels.com.au/uploads/1/3/2/6/132682134/c8e6739eb7205cb.pdf
    • http://files.coventryvineyard.org/uploads/1/3/1/3/131383924/lepukexoger_zomusagunag_jozotawurinaba_notog.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zimupumunilojoduwa.pdf
    • https://cdn.shopify.com/s/files/1/0432/0896/6301/files/jubirelafikakuzaripejo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/zosizasolivezoxozobab.pdf
    • https://cdn.shopify.com/s/files/1/0428/4055/5676/files/gufonojumugiwidab.pdf
    • https://cdn.shopify.com/s/files/1/0438/5888/6806/files/buzakurofibodavate.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20597849085.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1295/files/rifubimifubitofaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/49181926903.pdf
    • https://cdn.shopify.com/s/files/1/0437/1211/8952/files/minecraft_education_edition_apk.pdf
    • https://cdn.shopify.com/s/files/1/0429/5832/3865/files/denotalivuber.pdf
    • https://cdn.shopify.com/s/files/1/0432/8734/7364/files/ribosibigoke.pdf
    • https://cdn.shopify.com/s/files/1/0435/4143/0440/files/dolop.pdf
    • https://cdn.shopify.com/s/files/1/0430/8054/8503/files/lojixiwunififivojuv.pdf
    • https://cdn.shopify.com/s/files/1/0440/8197/1365/files/88710611243.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/37354855231.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_off00006932.bin
bcaf659284cc16599152853018ba37b3660c426240725a52694a0c65d318e9b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6932 5040 bytes
font_01_sfnt_off00007a64.bin
342673197cf9675b92a501f49ab37e636e4eb52946903111569b71e5bb7cbcd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A64 14712 bytes
font_02_sfnt_off0000a850.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA850 4324 bytes

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