Malicious PDF — malware analysis report

Static analysis result for SHA-256 81afdce25cab8f5e…

MALICIOUS

PDF

58.3 KB Created: 2020-08-28 20:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2860481aae3468f44e626a03d2cd2312 SHA-1: 891a4bfed87a154de438a0e2d28cc0c3d7235798 SHA-256: 81afdce25cab8f5e6e2e30e11d2616626b655438fc5d3099e8a1d0e5afd8b83a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF file contains a large number of embedded links, many of which point to a link farm hosted on Shopify. The primary malicious URL, ttraff.cc, is identified as a redirector. The document body, though heavily obfuscated, contains the same malicious URL, suggesting it's the intended lure. The ML classifier strongly flagged this PDF as malicious.

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/wix?keyword=warframe+best+sentinel+weapon
    • https://cdn.shopify.com/s/files/1/0431/7164/3554/files/sosuvidokotemapujuveje.pdf
    • https://cdn.shopify.com/s/files/1/0428/9619/5737/files/graphene_nanosheets_properties.pdf
    • https://cdn.shopify.com/s/files/1/0430/7750/1079/files/artificial_neural_networks_tutorials_point.pdf
    • https://cdn.shopify.com/s/files/1/0434/0298/5626/files/pathfinder_bestiary_5.pdf
    • https://cdn.shopify.com/s/files/1/0433/7201/9877/files/management_reporter_2012_default_port.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/84522812953.pdf
    • https://cdn.shopify.com/s/files/1/0440/7522/1144/files/when_youre_good_to_mama_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0432/8580/7269/files/sonavalibujozunufu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0632/7959/files/bemobi_mobile_store_jar.pdf
    • https://cdn.shopify.com/s/files/1/0431/2206/5557/files/baklol_video_part_7.pdf
    • https://static.usrfiles.com/ugd/b8c837_23de9b25a7244af8b20cabae8e05d6d0.pdf
    • https://static.usrfiles.com/ugd/b8c837_0cb7a68ba40f40898af76c2d6bd1c429.pdf
    • https://static.usrfiles.com/ugd/b8c837_861183074ec84b019bfb727e8f6b6c40.pdf
    • https://static.usrfiles.com/ugd/b8c837_608f256606fc4cddb6c01466de91364c.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1a4742eb5d045ea850a6c93b6a45d7b.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c315e1065d446e2ae67cf8361e2fa41.pdf
    • https://static.usrfiles.com/ugd/b8c837_023c3f9e750b484f8a16210357773a9f.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_off000098f9.bin
0404d3d20a087a7f09be30f08eaca0d199a94c8b311a4a062407a7e23a54a662		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98F9 5080 bytes
font_01_sfnt_off0000aa29.bin
a5c69f72dc9c205d16586843e10e1be6b70dc5b41a1e7ec27b1161061d507da4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA29 10468 bytes
font_02_sfnt_off0000cdef.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEF 4324 bytes

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