Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58efd1896fed1df…

MALICIOUS

PDF

46.4 KB Created: 2020-07-26 18:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 230c3f532250b179499a7a6fd9156561 SHA-1: df39a4d7f056fd4c9e3370c480825f853b01ec34 SHA-256: b58efd1896fed1dfb117e95e7f9bcbe7136c24b1c01e9d4612bf792cea29c086
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The embedded links, particularly the one to 'ttraff.com', suggest a phishing or malware distribution attempt. No scripts were extracted, but the sheer volume of outbound links points to a delivery mechanism for further malicious activity.

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.com/pify?keyword=proper+tennis+backhand+form
    • http://files.ferrofluid-design.com/uploads/1/3/2/6/132681587/7c291063a6ce9c.pdf
    • http://files.worldwidedobermans.com/uploads/1/3/1/4/131437750/duserofudi.pdf
    • http://files.heart-art-13.com/uploads/1/3/2/6/132682899/c967775.pdf
    • http://files.hannahpurdyfoggin.com/uploads/1/3/1/4/131483083/4529618.pdf
    • http://files.peschketruckinginc.com/uploads/1/3/1/3/131384442/dimuduxigivopep_venivewaxepu_tojumojilovowo_nularagazeku.pdf
    • https://cdn.shopify.com/s/files/1/0429/0809/0535/files/88479439451.pdf
    • https://cdn.shopify.com/s/files/1/0435/4313/4362/files/lulitego.pdf
    • https://cdn.shopify.com/s/files/1/0432/9000/1572/files/fopotiwezekenepuxodizojap.pdf
    • https://cdn.shopify.com/s/files/1/0437/8905/8209/files/bamiputemonejorize.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9444/files/buberibi.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/99497450961.pdf
    • https://cdn.shopify.com/s/files/1/0431/5601/3205/files/54707288868.pdf
    • https://cdn.shopify.com/s/files/1/0434/5774/0967/files/5559988289.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/lulejufawe.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7649/files/gimilide.pdf
    • https://cdn.shopify.com/s/files/1/0428/6955/5359/files/65211739091.pdf
    • https://cdn.shopify.com/s/files/1/0440/7181/3285/files/17343930193.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/80155326316.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_off000077cf.bin
224fae04373b0518986bfe127f1ace86f63215bfecb5ef823225ce5f240cb250		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77CF 5356 bytes
font_01_sfnt_off000089c7.bin
1ec2a4cd2cb02fdac2a8cde6b0a8acde5ae528af1e11a434dc2c29630bc4dc5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89C7 10188 bytes

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