Malicious PDF — malware analysis report

Static analysis result for SHA-256 832c23652f70602a…

MALICIOUS

PDF

46.2 KB Created: 2020-08-20 18:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a89c36ec3bd5dde0a632b4d658aa45e SHA-1: 517f97fa3e60d0a2650074157ccff7ea7177d022 SHA-256: 832c23652f70602a5298dce6c8272fb25aaf96a6524da418c0403db911caa86f
154 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, embedding numerous external links, with a primary redirector pointing to 'ttraff.com'. This suggests an attempt to lure users to potentially malicious websites. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body was largely unreadable, making the analysis reliant on the PDF structure and embedded links.

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=mandated+reporter+california+elder+abuse
    • http://files.stepupanddosomething.org/uploads/1/3/1/6/131637498/darorijuzipa.pdf
    • http://files.alankendallmusic.com/uploads/1/3/1/8/131856937/139e561221d45.pdf
    • http://lupik.nostalgictreasures.com/uploads/1/3/1/1/131164250/09d3cc84f.pdf
    • http://komeru.phoenixtattoos.site/uploads/1/3/1/6/131637814/kizafuzofixajo_napifibereribo_kivovasiv.pdf
    • http://files.waypentecostalchurch.org/uploads/1/3/1/8/131856185/9262248.pdf
    • https://cdn.shopify.com/s/files/1/0427/8845/4559/files/20120261088.pdf
    • https://cdn.shopify.com/s/files/1/0429/4456/1318/files/99408829485.pdf
    • https://cdn.shopify.com/s/files/1/0432/6922/6656/files/kosuzaliluk.pdf
    • https://cdn.shopify.com/s/files/1/0432/3147/7922/files/all_types_of_android_os_names.pdf
    • https://cdn.shopify.com/s/files/1/0438/0144/4514/files/53516068617.pdf
    • https://cdn.shopify.com/s/files/1/0438/2926/4546/files/93007882234.pdf
    • https://cdn.shopify.com/s/files/1/0447/9365/9541/files/23721643100.pdf
    • https://cdn.shopify.com/s/files/1/0428/9809/6284/files/longman_idioms_dictionary_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/2901/2381/files/35703541737.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_off0000771d.bin
20b968b32526504b1098f049f89ae32f2c21b64a1c277fc9911d24bae350af37
pdf-font-stream PDF embedded font (sfnt) at offset 0x771D 5292 bytes
font_01_sfnt_off0000891f.bin
5718b30f3c0358e46a75049fb5703e3a7ede0e1ced9c58bab58954406cbe4cac
pdf-font-stream PDF embedded font (sfnt) at offset 0x891F 10248 bytes