Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90079902ea87aa3…

MALICIOUS

PDF

43.2 KB Created: 2020-08-31 17:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e1df82270c77313cfcec653f71b8fb5 SHA-1: ccaffee0cbc812f60bbbbd6c8040f26dfe4c4124 SHA-256: f90079902ea87aa332d5dcc0dd3611dc11bd3010620199135fea002744431408
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final malicious destination. Another heuristic indicates a PDF link farm, with many links pointing to Shopify-hosted PDFs, suggesting a coordinated effort to distribute malicious content or manipulate search results. The document body contains text related to 'bridging the gap 13th edition answers' and includes the malicious redirector URL, reinforcing the lure.

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/pify?keyword=bridging+the+gap+13th+edition+answers
    • https://cdn.shopify.com/s/files/1/0431/8871/5682/files/surijetubenalaxixal.pdf
    • https://cdn.shopify.com/s/files/1/0437/5419/3047/files/vikutudutewikidujopasi.pdf
    • https://cdn.shopify.com/s/files/1/0469/4376/4641/files/major_events_in_catcher_in_the_rye.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15906675896.pdf
    • https://cdn.shopify.com/s/files/1/0439/2045/7883/files/construct_angle_bisector_worksheet.pdf
    • https://static.usrfiles.com/ugd/b8c837_bca60d34ebaf4d7b82910ce054db4c36.pdf
    • https://static.usrfiles.com/ugd/8e1900_ae02978a89ce46d4b761a098ca091172.pdf
    • https://static.usrfiles.com/ugd/b8c837_68ec34e6b1e342d9bd4f985a1cb969b2.pdf
    • https://static.usrfiles.com/ugd/b80405_102dc1ed18824890a5f04c2d66b24a78.pdf
    • https://cdn.shopify.com/s/files/1/0428/7961/5142/files/jaded_lyrics_green_day.pdf
    • https://cdn.shopify.com/s/files/1/0430/6177/2442/files/pulikoxokil.pdf
    • https://cdn.shopify.com/s/files/1/0433/5747/0872/files/zewufedeno.pdf
    • https://cdn.shopify.com/s/files/1/0450/3309/5326/files/qatar_airways_management_information_system.pdf
    • https://cdn.shopify.com/s/files/1/0461/3390/3513/files/antinomy_of_common_flowers_english_patch.pdf
    • https://static.usrfiles.com/ugd/0f1814_02b4c1d7439b43c195c1f3c22c294049.pdf
    • https://static.usrfiles.com/ugd/097bd5_6b6384c3e5ae4611a768a13929709c26.pdf
    • https://static.usrfiles.com/ugd/b8c837_faf09e797d1f4b0fb87d35e76c5b673f.pdf
    • https://static.usrfiles.com/ugd/269bb8_51f638d5f79b463c920ed64b646ad2d4.pdf
    • https://static.usrfiles.com/ugd/9421c8_ac11a26973c04fc7a1d40e688555384f.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_off0000688d.bin
7c13a744fbc1b374e95d7f66fdd036018f6fe7d50d0bdc084b9d11688e189663		 pdf-font-stream PDF embedded font (sfnt) at offset 0x688D 5548 bytes
font_01_sfnt_off00007b7b.bin
afffc48423dab3414729f1a1d552fca22760799b4647e3461db519a1c56f891f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B7B 10600 bytes

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