Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec334442467098e…

MALICIOUS

PDF

47.8 KB Created: 2020-08-09 22:39:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 305e70d039d33a0625fb35fc9043dce4 SHA-1: e80da2acebab75a2516b1744d3c59aee787157d7 SHA-256: dec334442467098ee976b1e6b7ca07b8dd59206b3fd42673b3106d1475f9a16f
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one primary malicious redirector URL. The document body, though heavily obfuscated, contains references to the malicious URL and benign-looking PDF filenames, likely to improve SEO and disguise the malicious intent. The ML classifier strongly indicated maliciousness.

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=carb+cycling+diet+plan+pdf+uk
    • http://files.casa-campbell.com/uploads/1/3/1/4/131437311/jativetodiva-kevadoninadut-lodafufigetunip.pdf
    • http://pepabomet.peacepantry.org/uploads/1/3/1/1/131164250/56156c43a.pdf
    • http://files.infantmassagenewzealand.org/uploads/1/3/0/7/130738741/xotarelagaxes_mamupuzuda_lajosulufujiz.pdf
    • http://files.candacedowning.com/uploads/1/3/0/7/130740213/bejazodokoxob.pdf
    • http://files.gametimesportschesterfield.com/uploads/1/3/1/3/131384401/nufaganitumuzenog.pdf
    • https://cdn.shopify.com/s/files/1/0439/4231/4152/files/electrical_design_for_residential_building.pdf
    • https://cdn.shopify.com/s/files/1/0432/2656/2722/files/6924493724.pdf
    • https://cdn.shopify.com/s/files/1/0437/1123/4197/files/kijov.pdf
    • https://cdn.shopify.com/s/files/1/0431/5339/1780/files/40665117067.pdf
    • https://cdn.shopify.com/s/files/1/0432/1483/1780/files/17182233891.pdf
    • https://cdn.shopify.com/s/files/1/0437/0484/4442/files/wimebotudexizijowane.pdf
    • https://cdn.shopify.com/s/files/1/0432/3124/8539/files/3435204094.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/20604720305.pdf
    • https://cdn.shopify.com/s/files/1/0437/7578/7162/files/35061318781.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/duvavogev.pdf
    • https://cdn.shopify.com/s/files/1/0428/9275/5103/files/tuvibarudagax.pdf
    • https://cdn.shopify.com/s/files/1/0432/8125/2508/files/nidedetokoxelepivevegani.pdf
    • https://cdn.shopify.com/s/files/1/0435/1708/3802/files/1644239457.pdf
    • https://cdn.shopify.com/s/files/1/0428/1945/3095/files/18264553758.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b90.bin
a4641bdbdc7bca61cd4adaf2c6ef3a3dff8d01b0df173f429e74c3221b872a0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B90 5356 bytes
font_01_sfnt_off00008ddc.bin
4682470668b1ddd0f006f86792d8b38d5e8b36048192b842ea1d1885ec0d9446		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DDC 10560 bytes

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