Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b227032bf0cfd9…

MALICIOUS

PDF

43.1 KB Created: 2020-09-05 02:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db234144659320819bb4a12ad8d07ea7 SHA-1: 9763f7e3bba06b4693c692d14e15e8723c5bb907 SHA-256: 88b227032bf0cfd9f83ec0df27efe06eeb4a4035dfe63533a0d15f3587a40e95
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic identifying it as a PDF link farm. One prominent link, 'https://ttraff.me/wix?keyword=make+games+for+android+without+coding', is flagged as a malicious redirector. The document body, though partially corrupted, also contains this URL and other PDF links hosted on Shopify, suggesting a tactic to manipulate search engine results or redirect users to malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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.me/wix?keyword=make+games+for+android+without+coding
    • https://cdn.shopify.com/s/files/1/0429/8362/0757/files/contaminacion_ambiental_ensayo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/viborovikumowenaben.pdf
    • https://cdn.shopify.com/s/files/1/0434/6570/3590/files/belt_conveyor_design_project.pdf
    • https://cdn.shopify.com/s/files/1/0433/7886/8387/files/mathrubhumi_calendar_2020_free.pdf
    • https://cdn.shopify.com/s/files/1/0451/8179/6503/files/dotovataxo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1350/4156/files/c._f._c_full_form.pdf
    • https://cdn.shopify.com/s/files/1/0462/5619/3687/files/zorurinujazatajosodakove.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/duliwoledemovaj.pdf
    • https://static.usrfiles.com/ugd/3254bf_710bb8a01c3a46ce8d0ce23311969975.pdf
    • https://static.usrfiles.com/ugd/21e6f2_be9b4ef7f8b34ddeb7353e3dd8773816.pdf
    • https://static.usrfiles.com/ugd/b8c837_b163dd7a12994e479ffc31d4ffef78a0.pdf
    • https://cdn.shopify.com/s/files/1/0436/2996/9561/files/83889157214.pdf
    • https://cdn.shopify.com/s/files/1/0464/9127/1320/files/hairspray_musical_script.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nimapudusakodinufuzexive.pdf
    • https://cdn.shopify.com/s/files/1/0462/1710/1466/files/real_boxing_free_download.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_off000069fb.bin
7e8901082a475dfa948898b7f159e3afed66fa612c62719c3ce48bfede134616
pdf-font-stream PDF embedded font (sfnt) at offset 0x69FB 5564 bytes
font_01_sfnt_off00007ce5.bin
336caee1e88f71657303279c0467f2976d9cef532ff53392915f49c9a38b0a53
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE5 10080 bytes