Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b143a063b8c2bc…

MALICIOUS

PDF

45.0 KB Created: 2020-08-27 21:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3074cb726c8ac81c82ae602bb648943e SHA-1: 3812f0016699f0d0154eafde004cbb7cc7371e33 SHA-256: 90b143a063b8c2bc2fd5a6bc2acc47f8574d860118707c7730b315ad7b1cbb4b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links, one of which, 'https://ttraff.cc/pify?keyword=limitaciones+de+un+proyecto+de+inves', is identified as a malicious redirector. The document also exhibits characteristics of a link farm, with numerous external PDF links, suggesting an attempt to drive traffic to potentially malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

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=limitaciones+de+un+proyecto+de+inves
    • http://files.diybuilds.ca/uploads/1/3/1/0/131069763/kejamenoxiwan_detumegusonuri_luweja_ximozasorevut.pdf
    • http://files.foring.org/uploads/1/3/1/4/131438658/dadad_gemunonakaj.pdf
    • http://files.bobsearle.net/uploads/1/3/0/9/130969354/wimuw-xutoxugaremi-togebefo.pdf
    • http://sejoja.saousfsm.org/uploads/1/3/0/8/130874247/mufugerek_xoweginuwi_letigopuf_waxeratavawugo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8986/files/rowefagob.pdf
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/96468066746.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/digalikerewuxajevukadud.pdf
    • https://cdn.shopify.com/s/files/1/0434/2523/5111/files/lifipikofo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1137/5267/files/52637902101.pdf
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/mosanijan.pdf
    • https://cdn.shopify.com/s/files/1/0431/6400/8605/files/oxford_university_press_elt_catalogue_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/2231/0811/files/37853171810.pdf
    • https://cdn.shopify.com/s/files/1/0433/7732/8278/files/59515923476.pdf
    • https://cdn.shopify.com/s/files/1/0431/5529/2321/files/vceguide_networking_fundamentals.pdf
    • https://cdn.shopify.com/s/files/1/0465/1204/6230/files/49014626641.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4453/files/bayesian_analysis_with_python_osvaldo_martin.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_off000063c6.bin
b5a9c41efeae976b879968134b5a3f9d625720dfe55dc19880130688f9ea1613		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63C6 5172 bytes
font_01_sfnt_off0000753e.bin
b826b666ae7da48afddb862800fec5c18a844cf794a1ea95b506a609539491d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x753E 10872 bytes
font_02_sfnt_off00009871.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9871 4324 bytes

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