Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c985db6fb511de…

MALICIOUS

PDF

49.0 KB Created: 2020-08-25 07:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b0c9a98525b99b1adba3baffaac07e7 SHA-1: 13654b404b219483c41a5a5c43ccdfa577cda5f1 SHA-256: e5c985db6fb511deaccf5d353b9e1b2c7cbf1e0de88e8890e1ad5eb90ec0950f
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. The link directs to 'ttraff.cc', a known malicious redirector. The document body text, though partially corrupted, contains keywords related to a 'prentice hall geometry textbook answer key' and the malicious URL, suggesting a social engineering lure. The PDF also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, likely for SEO manipulation or to host further malicious 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=prentice+hall+geometry+textbook+answer+key
    • http://files.mrwaldau.com/uploads/1/3/1/3/131382274/sijon.pdf
    • http://ziperi.louisianacareerdevelopment.org/uploads/1/3/0/8/130814328/negemobuwevunajun.pdf
    • http://files.rogerckellygroup.com/uploads/1/3/0/9/130969686/gozurazonud.pdf
    • https://cdn.shopify.com/s/files/1/0429/7719/8229/files/e_reporter_beed.pdf
    • https://cdn.shopify.com/s/files/1/0438/1786/1277/files/arputham_movie_songs_starmusiq.pdf
    • https://cdn.shopify.com/s/files/1/0435/9343/3246/files/5239917777.pdf
    • https://cdn.shopify.com/s/files/1/0435/8553/6161/files/battle_cats_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9933/files/35977676515.pdf
    • https://cdn.shopify.com/s/files/1/0429/5042/6787/files/44253719492.pdf
    • https://cdn.shopify.com/s/files/1/0431/1308/7142/files/fortify_reportgenerator_command_line.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/25272255210.pdf
    • https://cdn.shopify.com/s/files/1/0437/7224/8215/files/zokixideveresolusidi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4451/1645/files/lumiwi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4016/files/xejav.pdf
    • https://cdn.shopify.com/s/files/1/0435/5650/3707/files/epidemiologia_social.pdf
    • https://cdn.shopify.com/s/files/1/0427/7351/2359/files/63735169648.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/
    • https://cdn.shopify.com/s/files/1/0429/5042/6787/files/4

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063de.bin
2f62f0992d69cf7e306f8b8811b75a034f8769f67119534f700f1f88b8d755db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63DE 5468 bytes
font_01_sfnt_off00007650.bin
48c19f272882d21c021ad7104b453786f6d5eda9f4184dedc6baec7a16850bcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7650 15180 bytes
font_02_sfnt_off0000a5de.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5DE 4324 bytes

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