Malicious PDF — malware analysis report

Static analysis result for SHA-256 700711b66af5c695…

MALICIOUS

PDF

44.7 KB Created: 2020-08-25 16:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5e831ffb52f1addb577705bd597382e SHA-1: a194509f1877707548d283118acf86a96c080602 SHA-256: 700711b66af5c69577ef55a498e3fbd52cb5a8eac2206c38e5c442c794586940
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, disguised as a worksheet answer key. It also exhibits characteristics of a link farm, with numerous outbound links to external PDFs, many hosted on Shopify. The ML classifier strongly indicates maliciousness. No scripts were extracted, but the presence of a malicious redirector suggests an attempt to lead the user to a malicious site.

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/pify?keyword=nuclear+weapons+fission+and+fusion+worksheet+answers
    • http://files.ccprofessionaltaxservices.net/uploads/1/3/0/9/130969899/gazaxi-vuvonederovu.pdf
    • http://gufev.gclx.org/uploads/1/3/2/6/132683138/vexigagebi.pdf
    • http://files.householdwater.com/uploads/1/3/1/3/131381679/kimok.pdf
    • http://files.stocktontrapandskeet.com/uploads/1/3/1/8/131856672/6dc0c891d667.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2332/7644/files/information_about_captain_james_cook.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/dofetodivewigewigat.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/ihra_rule_book_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lomapatigusobotatijizu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6768/6556/files/ciencia_social_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0436/9245/8152/files/classic_car_value_guide_uk.pdf
    • https://cdn.shopify.com/s/files/1/0433/9928/2845/files/thomas_and_friends_theme_song.pdf
    • https://cdn.shopify.com/s/files/1/0452/9192/9761/files/the_human_brain_and_its_functions.pdf
    • https://cdn.shopify.com/s/files/1/0434/6360/6429/files/73204302971.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8775/files/chirutha_movie_naa_songs.pdf
    • https://cdn.shopify.com/s/files/1/0432/4681/3344/files/46330707322.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/how_to_mass_delete_messages_on_discord.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_off00006de4.bin
8aee309b6e927f2f3d990764d4c6bac6b8c5c67896863c30e6775ed4d138c31d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE4 5368 bytes
font_01_sfnt_off00008032.bin
33660723f6ce726c4d94c62d9055d6270dcaf2c3baa42d5c39da01f499d57608		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8032 10900 bytes

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