Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbdd83365a548848…

MALICIOUS

PDF

42.8 KB Created: 2020-09-05 00:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e7f5f0a67f4fd5df5bbcc530f453815 SHA-1: 2b64cdf7fd51f32f247beb5d70c6bdaddca99e66 SHA-256: dbdd83365a5488481c873cfc5290b2ef0446d766fc8301387a3c5e060b193052
152 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains text related to a 'Bosch washer manual' and the malicious URL, suggesting a lure to trick users into clicking the link. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, further supporting the malicious intent of this document.

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.club/wix?keyword=bosch+washer+manual
    • https://static.usrfiles.com/ugd/0e6328_c6519b2e190d495984757b520fd80090.pdf
    • https://static.usrfiles.com/ugd/ace02d_d0064cce13044877b64fd498f2f03543.pdf
    • https://static.usrfiles.com/ugd/15cd4d_8838a82f84e54991ae10cb634382066b.pdf
    • https://static.usrfiles.com/ugd/286fb8_9ec92b535aaf4a3586cef0cdbc25b699.pdf
    • https://cdn.shopify.com/s/files/1/0435/4637/8404/files/fire_proof_crossword_answer.pdf
    • https://cdn.shopify.com/s/files/1/0433/6500/7509/files/dazufuvizobazuwasajow.pdf
    • https://cdn.shopify.com/s/files/1/0462/4809/9991/files/98290144145.pdf
    • https://cdn.shopify.com/s/files/1/0437/7647/5290/files/mobile_test_automation_with_appium_nishant_verma_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/5890/5759/files/57190442095.pdf
    • https://cdn.shopify.com/s/files/1/0431/1954/2434/files/56106123875.pdf
    • https://cdn.shopify.com/s/files/1/0461/9704/7447/files/64759644565.pdf
    • https://cdn.shopify.com/s/files/1/0435/1610/0776/files/66895783075.pdf
    • https://cdn.shopify.com/s/files/1/0432/8525/0216/files/62165671584.pdf
    • https://cdn.shopify.com/s/files/1/0428/5267/9836/files/minecraft_team_extreme_launcher_download_free_1.8.8.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_off000069e8.bin
7f548504a2a256dd921e61e8c4291ca25c49602c0dbc94715def736df78bcc14
pdf-font-stream PDF embedded font (sfnt) at offset 0x69E8 5180 bytes
font_01_sfnt_off00007b72.bin
f7e35397daaa96fc812d16104729072f0b7cbc55f5ea4b86d49f485f755dbb0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B72 10228 bytes