Malicious PDF — malware analysis report

Static analysis result for SHA-256 1235edb85e871477…

MALICIOUS

PDF

45.5 KB Created: 2020-08-23 07:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4dd02685d588646a98f8aca0fe2a748e SHA-1: d55abd1d5029b6ec617ae446f02048d6ff54e99b SHA-256: 1235edb85e8714776fae1b1e4bb969660019a86ebd0dc78acbadd9bb8519bfad
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of embedded links, many of which point to a link farm designed for SEO manipulation. One prominent link, https://ttraff.cc/pify?keyword=fake+caller+id+mod+apk+latest+version, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this malicious URL, suggesting an attempt to trick users into visiting it, likely for further malicious activity such as malware distribution.

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.cc/pify?keyword=fake+caller+id+mod+apk+latest+version
    • http://files.grimballcotterill.com/uploads/1/3/1/8/131858045/varisevinopufofot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/3825/0910/files/ecology_and_applications_of_benthic_foraminifera.pdf
    • https://cdn.shopify.com/s/files/1/0435/1967/2472/files/wobajabokebuzibife.pdf
    • https://cdn.shopify.com/s/files/1/0434/7166/7360/files/wupumilewuxaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/1404/5341/files/panoxirebebebojem.pdf
    • https://cdn.shopify.com/s/files/1/0446/2074/2819/files/advocare_24_day_challenge_cleanse_phase.pdf
    • https://cdn.shopify.com/s/files/1/0434/6285/2773/files/jepowusobajudepo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8538/9221/files/tibuveza.pdf
    • https://cdn.shopify.com/s/files/1/0435/1796/8536/files/can_t_stop_the_feeling_piano.pdf
    • https://cdn.shopify.com/s/files/1/0438/0635/9713/files/84432144502.pdf
    • https://cdn.shopify.com/s/files/1/0435/2966/6724/files/81747973022.pdf
    • https://cdn.shopify.com/s/files/1/0435/6728/4387/files/zuvukilimefotiruferakagu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9601/5002/files/34570662032.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6656/files/basic_spoken_english_in_tamil.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e4a.bin
cd9e3faf8ba836d0a7c45cdf977c260a378bee84029584be6f506303d8ffd350		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E4A 5300 bytes
font_01_sfnt_off0000703f.bin
72f542c7f05ce896a296201577202eb4553c2e3edf02a2b0ec925f15e9ac0a7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x703F 10420 bytes
font_02_sfnt_off00009417.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9417 16092 bytes

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