Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9317feb562de653…

MALICIOUS

PDF

54.3 KB Created: 2020-08-31 10:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f367c6c1c27d0aff2547923e97851f8 SHA-1: 152a4f4e8ec99b7f1578023a09c2a01ab23b797a SHA-256: b9317feb562de6533fd708659e3d67c316ee862da3c14194fe997d86eeacded2
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a link to a known malicious redirector. It also features a large number of external PDF links, many hosted on cdn.shopify.com, suggesting a link farm or SEO poisoning attempt. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to a phishing or malware distribution 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.cc/wix?keyword=carlos+fuentes+works
    • https://cdn.shopify.com/s/files/1/0436/1627/2547/files/jomoloned.pdf
    • https://cdn.shopify.com/s/files/1/0435/5322/6913/files/surimofara.pdf
    • https://cdn.shopify.com/s/files/1/0432/9635/8565/files/80610879425.pdf
    • https://cdn.shopify.com/s/files/1/0435/8674/8579/files/jukazejokulop.pdf
    • https://cdn.shopify.com/s/files/1/0432/3167/4535/files/rivufifizikiluti.pdf
    • https://static.usrfiles.com/ugd/b8c837_935f39ae9fc64dfdafd45904ef9bd08c.pdf
    • https://static.usrfiles.com/ugd/eb5a6a_49f807a414fc4813960bffb3074d0ff5.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9dcbb7440464f94805d8184ef6f772f.pdf
    • https://static.usrfiles.com/ugd/21e6f2_8a2caf13bc484810ae8c91864c2b0c36.pdf
    • https://static.usrfiles.com/ugd/b8c837_f2b9532331dc4e2fb6faa92178c372c5.pdf
    • https://cdn.shopify.com/s/files/1/0429/9436/8663/files/61310896443.pdf
    • https://cdn.shopify.com/s/files/1/0428/5287/6455/files/lataxufu.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3949/files/18944639884.pdf
    • https://cdn.shopify.com/s/files/1/0432/9373/7118/files/tamil_3gp_movies.pdf
    • https://cdn.shopify.com/s/files/1/0429/2280/3366/files/todovozelut.pdf
    • https://cdn.shopify.com/s/files/1/0438/2805/2130/files/data_acquisition_for_sensor_systems_taylor.pdf
    • https://cdn.shopify.com/s/files/1/0432/9055/8622/files/dinewurenorezimub.pdf
    • https://cdn.shopify.com/s/files/1/0430/4034/2169/files/com_song_video_khasi_gospel_mp4.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_off000088a5.bin
59852682dceb5bee672f03e7b632ce2dc6a2ce1ab80b851fbedc22a1590cd98f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88A5 4772 bytes
font_01_sfnt_off00009908.bin
c61e5aaee22695f2be0f25d0d40e638c461b21577d6a5935d6dec81f4bb9419f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9908 11108 bytes
font_02_sfnt_off0000be05.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE05 4324 bytes

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