Malicious PDF — malware analysis report

Static analysis result for SHA-256 c254e456b4316b0e…

MALICIOUS

PDF

51.0 KB Created: 2020-08-30 22:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bedd4ee8de642de14bec79023e11581 SHA-1: b7f53b6e2478c43233b6c0c9d423cc62298d11e3 SHA-256: c254e456b4316b0e63312c7cd20383d145d91aaf03621f7ffb61e122ac42b219
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a large number of embedded links to other PDFs, characteristic of a link farm. One of these links, 'https://ttraff.ru/wix?keyword=acnl+black+rose+guide', points to known malicious redirector infrastructure. The document body contains garbled text and the authoring application is wkhtmltopdf, suggesting it was programmatically generated to host these 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/wix?keyword=acnl+black+rose+guide
    • https://cdn.shopify.com/s/files/1/0440/0427/8422/files/zogoxosexewozabe.pdf
    • https://cdn.shopify.com/s/files/1/0433/4397/0463/files/pibitegapefatakowilutudi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2093/5590/files/blue_white_a2_pump_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/5957/5958/files/xxx_password_hacking.pdf
    • https://cdn.shopify.com/s/files/1/0436/6086/9785/files/54857708494.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vevisip.pdf
    • https://cdn.shopify.com/s/files/1/0433/3663/0422/files/barron_s_gre_21st_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/1615/9381/files/57422165104.pdf
    • https://cdn.shopify.com/s/files/1/0434/9476/8792/files/dying_light_the_following_ps4_trophy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/figarawevig.pdf
    • https://cdn.shopify.com/s/files/1/0429/3260/0985/files/gonekonogirejelenukiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/65998538729.pdf
    • https://cdn.shopify.com/s/files/1/0431/7695/1965/files/chemistry_molecular_approach.pdf
    • https://cdn.shopify.com/s/files/1/0428/7817/3343/files/interpreting_bar_graphs_worksheets_2nd_grade.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_off00006e1c.bin
56b750a4294eb6d41d8689722edb55c2d6308051468436b01d5699628c196092		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E1C 5300 bytes
font_01_sfnt_off00008024.bin
b31d68304e3244ecd4c31638ced8acf7d3c7f8648ce09252ec69cc80a2043ec8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8024 13216 bytes
font_02_sfnt_off0000aaa7.bin
d8a1a34de14a7b8fce5e51635835121d353d188f9ac9ce1e11538509fd4c5cdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAA7 16060 bytes

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