Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b62b9f6b389971…

MALICIOUS

PDF

36.1 KB Created: 2020-10-26 00:36:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c234d85ae22aa2513340de4467a54954 SHA-1: 7e15e4dff204dad56a53844fc3844042c94b0e5d SHA-256: a8b62b9f6b389971d13e638148e5fd144371fc6af2418fe3ebd242f25e9458cd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a 'zebra tlp 2844 service manual' and the malicious URL, suggesting a lure for SEO spam or phishing. The presence of a large number of external links, many pointing to Shopify, indicates a link farm strategy.

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=zebra+tlp+2844+service+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0266/8386/7326/files/libros_jorge_baradit.pdf
    • https://cdn.shopify.com/s/files/1/0432/6873/5140/files/amazing_spiderman_2_apk_revdl.pdf
    • https://cdn.shopify.com/s/files/1/0427/6640/1692/files/sudo_cd_command_not_found_ubuntu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5194/8963/files/cordova_platform_android_version_list.pdf
    • https://uploads.strikinglycdn.com/files/2cfe8968-e1c5-4f6e-b98b-e2a0a42f116b/73452108389.pdf
    • https://uploads.strikinglycdn.com/files/aa25eedf-c47f-4bb0-8242-03da6715c972/obgyn_shelf_reddit.pdf
    • https://uploads.strikinglycdn.com/files/235546ce-1b32-4a64-bae7-59d2ba2952d5/50736223939.pdf
    • https://uploads.strikinglycdn.com/files/5b998d80-91e8-4f96-938c-633d33877f30/intimate_apparel_characters.pdf
    • https://uploads.strikinglycdn.com/files/9a5d70da-8545-4c39-bdc9-75b32d0653d1/cnet_droid_maxx.pdf
    • https://uploads.strikinglycdn.com/files/14f45b70-62c2-48e8-a974-2334b1178905/23998621309.pdf
    • https://uploads.strikinglycdn.com/files/25e4e65e-3cea-4e0e-b95b-f0734a00bc83/karuna_reiki_symbols_and_their_meanings.pdf
    • https://uploads.strikinglycdn.com/files/42e07844-f2f8-4ca6-8713-18b196fbbe2a/63929623176.pdf
    • https://uploads.strikinglycdn.com/files/25aace6f-44e9-45ad-a7eb-e4bfc346a973/17467394940.pdf
    • https://s3.amazonaws.com/zuxadol/simple_ordinary_annuity_problems_with_solutions.pdf
    • https://s3.amazonaws.com/banula/composicion_quimica_del_cemento_dental.pdf
    • https://s3.amazonaws.com/luramamelolem/zinenevarufodimif.pdf
    • https://cdn.shopify.com/s/files/1/0436/2207/2480/files/download_game_bike_mayhem_full_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0482/0720/0408/files/common_core_context_clues_worksheets_4th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0466/5281/7573/files/38782108950.pdf
    • https://cdn.shopify.com/s/files/1/0479/4721/9100/files/the_power_of_love_rhonda_byrne.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_off00004e9a.bin
4cccc0d7e2e33ae73266408a9f352abe28058260d8893bd4dad154c4b6590768		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E9A 5652 bytes
font_01_sfnt_off000061bf.bin
4a99256d8fb1bebe044efa707c5692b23744908952a3492c8abdad24de184250		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61BF 9848 bytes

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