Malicious PDF — malware analysis report

Static analysis result for SHA-256 04897f0bc2d9b8d6…

MALICIOUS

PDF

42.1 KB Created: 2020-08-03 11:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c42beb58cf04e583d417de0387b75db SHA-1: 8143a37bcd76f7732c04cfa6ef92d04a2fec22b9 SHA-256: 04897f0bc2d9b8d6e08e939d565384b958e5e329679b1c0a83408316950c7729
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to a link farm designed to generate traffic and SEO value. One prominent URL, https://ttraff.com/pify?keyword=week+calendar+2020+pdf+download, is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to calendar downloads, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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=week+calendar+2020+pdf+download
    • http://nonikasaz.middlegamevc.com/uploads/1/3/1/3/131383284/suwigikeratet_runudefor.pdf
    • http://files.obxexotics.com/uploads/1/3/1/4/131408899/e326b33791e2.pdf
    • http://files.mosaicvoices.net/uploads/1/3/0/8/130815311/c699c.pdf
    • http://files.adrayer.com/uploads/1/3/2/7/132710497/vizozodol_veponodebase.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7373/2768/files/wosevidajasopumewuzosovex.pdf
    • https://cdn.shopify.com/s/files/1/0428/1820/7911/files/zojegovefetemiwafib.pdf
    • https://cdn.shopify.com/s/files/1/0435/8841/9741/files/beveluzonedapimofagap.pdf
    • https://cdn.shopify.com/s/files/1/0433/3414/0072/files/80332693462.pdf
    • https://cdn.shopify.com/s/files/1/0432/5795/4464/files/dapeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/4522/3581/files/89812871407.pdf
    • https://cdn.shopify.com/s/files/1/0432/1044/0862/files/four_wind_motor_home.pdf
    • https://cdn.shopify.com/s/files/1/0433/3430/3912/files/80680063017.pdf
    • https://cdn.shopify.com/s/files/1/0434/2244/9814/files/bebobexafosugezaxibeb.pdf
    • https://cdn.shopify.com/s/files/1/0435/9543/2099/files/ff14_damage_meter.pdf
    • https://cdn.shopify.com/s/files/1/0428/5834/8700/files/guzokaziwut.pdf
    • https://cdn.shopify.com/s/files/1/0432/9131/2288/files/kotejavifavaxarinobipis.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063a1.bin
e011592531747e14477bd45193093b24dcdb9f3493d2ed5c053c52b41948f33e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A1 5412 bytes
font_01_sfnt_off0000763d.bin
b151a0c414971cabf13ec8295fad23b8a79b143ee78d48c5352734cea637bae0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x763D 11064 bytes

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