Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13d1b15d2c96c17…

MALICIOUS

PDF

37.9 KB Created: 2020-08-14 02:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0957531fb2084b26650569ce0ec4eaa SHA-1: 4f43507f8b14a1cb247fd4b87d221b2ab98a8a03 SHA-256: c13d1b15d2c96c1771bde1a0d80722e5d838e7f882fda9b144f17f75b717f2bf
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, pointing to ttraff.com. The document body, though heavily obfuscated, contains references to 'Dynamics 365 outlook app user guide' and includes the malicious URL. The presence of numerous external PDF links, many hosted on cdn.shopify.com, suggests a link farm or SEO poisoning tactic to distribute the malicious content. The ML classifier also strongly indicated maliciousness.

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=dynamics+365+outlook+app+user+guide
    • http://files.immortalize-your-moments.studio/uploads/1/3/1/0/131071082/gofopawul_xovax.pdf
    • http://files.sole2solereflexology.com/uploads/1/3/0/8/130873708/subumemale.pdf
    • http://files.atlanticcirqueagency.com/uploads/1/3/1/8/131871692/212501286c259.pdf
    • http://files.cainedelup.com/uploads/1/3/1/4/131452735/8daf5daf61e3d.pdf
    • https://cdn.shopify.com/s/files/1/0427/4218/6150/files/antropoloji_kitab.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2339/files/fiwerolusamuninunaw.pdf
    • https://cdn.shopify.com/s/files/1/0448/4608/8349/files/pokemon_yellow_guide_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/6670/4550/files/sissy_maid_training.pdf
    • https://cdn.shopify.com/s/files/1/0437/9302/3133/files/cas_hayley_walking_on_the_moon.pdf
    • https://cdn.shopify.com/s/files/1/0429/8883/0873/files/download_light_novel_arifureta_sub_indo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2979/7787/files/lubakakotagamorit.pdf
    • https://cdn.shopify.com/s/files/1/0433/4321/6789/files/electron_configuration_test.pdf
    • https://cdn.shopify.com/s/files/1/0428/5153/2963/files/imperatives_directions_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0447/2533/8265/files/agricultural_revolution_in_britain.pdf
    • https://cdn.shopify.com/s/files/1/0438/0190/3264/files/59338104258.pdf
    • https://cdn.shopify.com/s/files/1/0431/4424/9499/files/lixafusifafajasakaso.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_off00005524.bin
76f25a1b61c03bd1a47db55c56872b10a65fd3b827c0eae31e5769ab5ad100fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5524 6000 bytes
font_01_sfnt_off00006975.bin
6c55745668c1d7140ee614ee19121914788768921390fdf58b79800fbecc175c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6975 9696 bytes

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