Malicious PDF — malware analysis report

Static analysis result for SHA-256 948c954d6d744aa3…

MALICIOUS

PDF

48.5 KB Created: 2020-09-01 04:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12568b0f03b3b750f95afbfdae045ae4 SHA-1: aa8c7870a7bd55ac20636fa781f3471b943dcbf2 SHA-256: 948c954d6d744aa3ffa499094c17971ca36cc82dc70626c7f57d0472221542b0
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains a link to a known malicious redirector. It also features a link farm of numerous PDFs hosted on Shopify, suggesting an attempt to manipulate search results or distribute further malicious content. The primary malicious URL identified is https://ttraff.com/wix?keyword=cambridge+6+listening+test+3+answers.

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.com/wix?keyword=cambridge+6+listening+test+3+answers
    • http://geags.c
    • https://cdn.shopify.com/s/files/1/0432/5317/0339/files/career_education_definition.pdf
    • https://cdn.shopify.com/s/files/1/0433/8896/0919/files/cicely_berry_exercise.pdf
    • https://cdn.shopify.com/s/files/1/0432/6152/6166/files/anterior_horn_cell_disease.pdf
    • https://cdn.shopify.com/s/files/1/0440/3508/0342/files/mawonagikipovaxalopavod.pdf
    • https://cdn.shopify.com/s/files/1/0448/2508/4065/files/absceso_periamigdalino_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0464/6889/0782/files/chrome_bookmarks_sync_android.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3270/files/minobunafegufaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/45389555481.pdf
    • https://cdn.shopify.com/s/files/1/0438/6213/0848/files/75858566377.pdf
    • https://cdn.shopify.com/s/files/1/0432/7745/1428/files/3006125149.pdf
    • https://cdn.shopify.com/s/files/1/0436/0749/0717/files/evanescence_my_immortal_piano.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0294/files/the_celluloid_closet.pdf
    • https://cdn.shopify.com/s/files/1/0461/5421/9683/files/ubuntu_14._04_lts_server_iso.pdf
    • https://cdn.shopify.com/s/files/1/0435/7524/7009/files/goxigifivoxepugize.pdf
    • https://cdn.shopify.com/s/files/1/0432/1126/0062/files/eclipse_free_for_windows_8._1.pdf
    • https://cdn.shopify.com/s/files/1/0438/4305/9862/files/brandi_love_riley_reid.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_off00007e18.bin
b891adc82e9202fcbdb89ba930951e5b31f59a7cc2c200191eb6132a7e0c1442
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E18 5600 bytes
font_01_sfnt_off0000910f.bin
8ec31259d897589f6e3c8de033cd4ca9c1fd5fdc09d4ba60f004af8a020193f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x910F 10556 bytes