Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda750dbc5cc5ff6…

MALICIOUS

PDF

40.1 KB Created: 2020-10-31 03:25:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93696a928ed7fbd21cfad3794d3ee71e SHA-1: 8154f7881cee12c44e858aacb2b7fe21ac9ca368 SHA-256: fda750dbc5cc5ff687341d802ad03015d5c619c60e8b0992628976c65b1b277c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One prominent link directs to `https://ttraff.cc/123?keyword=fractions+made+easy+pdf`, which is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing the intent to redirect users to potentially harmful 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/123?keyword=fractions+made+easy+pdf
    • https://dunujamovexen.weebly.com/uploads/1/3/4/3/134361976/puxatixe_jekedobux_judotevonofad_kebigu.pdf
    • https://cdn-cms.f-static.net/uploads/4373271/normal_5f8dfb9490de7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8725/0087/files/ps3_emulator_games_apk.pdf
    • https://s3.amazonaws.com/rekorewexidiwo/balancing_chemical_reactions.pdf
    • https://cdn.shopify.com/s/files/1/0266/7823/1229/files/zovozibapetepubujodakab.pdf
    • https://cdn.shopify.com/s/files/1/0438/2212/1122/files/amc_movies_bloomington_il.pdf
    • https://cdn.shopify.com/s/files/1/0462/8463/6320/files/pengertian_jaringan_komputer_menurut_para_ahli.pdf
    • https://uploads.strikinglycdn.com/files/97eb033a-857f-4e5b-89ca-b30adccc37eb/the_raven_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0501/5843/6513/files/the_night_watchman.pdf
    • https://cdn.shopify.com/s/files/1/0507/3829/9052/files/cuantos_grados_centigrados_son_100_fahrenheit.pdf
    • https://cdn.shopify.com/s/files/1/0500/4273/2694/files/norwegian_joy_deck_plan.pdf
    • https://cdn.shopify.com/s/files/1/0506/5831/2366/files/bexodurowagotuw.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_off00005d04.bin
52606827bbb9fcbca1ac114d8547b869df0e56bfc36805fb3c25cc20fd58313c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D04 5324 bytes
font_01_sfnt_off00006f15.bin
a5431311eb66c2ff9f9de25f93451411b862a531560305fa231f810e9e8b74e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F15 10900 bytes