Malicious PDF — malware analysis report

Static analysis result for SHA-256 c192dda4f14bcf8b…

MALICIOUS

PDF

48.3 KB Created: 2020-08-14 06:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f37db277e95d0e1249d4c9c949501b36 SHA-1: 14a412d9657348af59c96e85b943b15edf1f677c SHA-256: c192dda4f14bcf8bfaeede9d271a64f293e1d4786928343fa570f2252334da46
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one URL, 'https://ttraff.ru/pify?keyword=capitulo+2a+actividad+12+answers', leads to known malicious infrastructure. The 'PDF_SEO_LINK_FARM' heuristic further suggests that the document is designed to host a mass of external links, likely for SEO manipulation or to distribute malicious content. The document body text, though partially corrupted, contains the phrase 'Capitulo 2a actividad 12 answers', suggesting a lure to trick users into clicking the 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.ru/pify?keyword=capitulo+2a+actividad+12+answers
    • http://files.magdazaslona.com/uploads/1/3/2/3/132303013/d1e805cf7e8d2.pdf
    • http://fojiv.trikalashelterdogs.com/uploads/1/3/0/7/130738902/5266317.pdf
    • http://files.gianlucastradiotto.com/uploads/1/3/0/7/130776402/88d2d70c3.pdf
    • http://files.centraleuropeanstringquartet.com/uploads/1/3/1/6/131637307/5073391.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/88999031817.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4993/files/sabudi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3124/8541/files/benchmarking_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3383/files/192_168_119_32400_web.pdf
    • https://cdn.shopify.com/s/files/1/0428/9432/7974/files/8122420511.pdf
    • https://cdn.shopify.com/s/files/1/0440/4976/0406/files/botanica_plantas_medicinales.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6436/files/sokimagene.pdf
    • https://cdn.shopify.com/s/files/1/0438/1389/6352/files/harcourt_math_4th_grade_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/3033/1047/files/xebezogafo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9957/files/pugaduw.pdf
    • https://cdn.shopify.com/s/files/1/0432/7813/9556/files/dolik.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4013/files/84697451218.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_off0000680e.bin
e723fc0bc3a9fc2e2743059f368c88ee961548879e11f6672daea8979b05ca73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x680E 5308 bytes
font_01_sfnt_off00007a3b.bin
7123bc990356bf367482f9062f5c52e4628144821454a18389f27d16540f421c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A3B 10588 bytes
font_02_sfnt_off00009e7a.bin
31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E7A 16204 bytes

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