Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a6a75ecc212ec3…

MALICIOUS

PDF

44.7 KB Created: 2020-09-16 18:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c567ae67f96f448fff7059fd33f52e56 SHA-1: 2571e3d295d60ef83a2ff40f0f89a54b743137a9 SHA-256: 53a6a75ecc212ec3dc00dff779372eddf0c2255269c97c7d9c60658e229cf053
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic identifying it as a redirector link to known malicious infrastructure. It also contains a large number of external links, many hosted on Shopify, which is characteristic of SEO link farms used to manipulate search results or distribute malicious content. The primary malicious URL identified is https://ttraff.me/wix?keyword=viruses%252Fbacteria+worksheet+key, which is likely the initial point of compromise.

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=viruses%252Fbacteria+worksheet+key
    • https://cdn.shopify.com/s/files/1/0453/9642/6920/files/ardagh_packaging_finance_plc_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0435/6128/7839/files/ligej.pdf
    • https://cdn.shopify.com/s/files/1/0433/9499/0243/files/pozafegulobidupilagadex.pdf
    • https://cdn.shopify.com/s/files/1/0440/0644/1110/files/schlage_keypad_locks_user_guide_be365.pdf
    • https://cdn.shopify.com/s/files/1/0432/0306/8068/files/betivoduxanaxuwobodi.pdf
    • https://cdn.shopify.com/s/files/1/0440/6594/7800/files/9464838310.pdf
    • https://cdn.shopify.com/s/files/1/0429/2077/1750/files/cisco_ise_licensing_guide_2._3.pdf
    • https://bb07f69b-ec45-43d9-9168-110807926a36.filesusr.com/ugd/e56fe2_b8c83f11eccf49368cd34d2ce7794882.pdf?index=true
    • https://570172ec-1f21-4b60-b7d3-d8c146cb179c.filesusr.com/ugd/e3325f_6699dc0fd6694976bf46320ac8730946.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0437/8981/1861/files/46140233933.pdf
    • https://cdn.shopify.com/s/files/1/0433/4059/5352/files/the_fall_of_lucifer_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/4517/5971/files/animal_reproduction_worksheets_for_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0431/7983/5547/files/ncc_song_free.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_off00006257.bin
f1ecd92cd5ee925b67d17bfea784de14a3153db477c8a1e2275b923051ef48a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6257 5032 bytes
font_01_sfnt_off000073a7.bin
051b6a3362f5bed6599cb1fc4e425284fd1c4f1364d46b16c5e1fcc439902116		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73A7 10188 bytes
font_02_sfnt_off00009677.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9677 4324 bytes

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