Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb88b761101f796a…

MALICIOUS

PDF

40.8 KB Created: 2020-08-22 22:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35b6d9f0b43952eeb4b00437afba2eac SHA-1: 484991e9316e1242f04270edca797c2044333211 SHA-256: fb88b761101f796a3d6257c94d202f187f0a1678d9350046acac4c572d0005f5
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The document body text, though partially obfuscated, includes keywords related to PDF manipulation, suggesting a lure to trick users into clicking the malicious link. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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/pify?keyword=add+watermark+to+pdf+adobe+reader+xi
    • http://files.longrangeacademy.com/uploads/1/3/0/7/130774994/doxad_rexebixezekodo_bulajexapow_tezirawesun.pdf
    • http://files.shleeart.net/uploads/1/3/1/4/131409037/gituwemek.pdf
    • http://files.seawatchingestaca.com/uploads/1/3/1/4/131437123/623fa.pdf
    • http://jopapu.oneilllab.com/uploads/1/3/1/6/131606490/fd4f011e457e2e.pdf
    • https://cdn.shopify.com/s/files/1/0438/2962/4992/files/baabul_movie_songs_mr_jatt.pdf
    • https://cdn.shopify.com/s/files/1/0433/8103/1064/files/funniest_kid_test_answers_part_14_dangmattsmith.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/minirefotapobizezuloxot.pdf
    • https://cdn.shopify.com/s/files/1/0438/4168/3618/files/57952346945.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1143/files/shake_hands_with_the_devil_book_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/1962/2808/files/47224972044.pdf
    • https://cdn.shopify.com/s/files/1/0433/7342/8888/files/togew.pdf
    • https://cdn.shopify.com/s/files/1/0432/3826/0899/files/4019217262.pdf
    • https://cdn.shopify.com/s/files/1/0439/2730/6408/files/face_color_corrector_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/7173/3917/files/16102438492.pdf
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/4th_grade_math_test_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/5993/6421/files/97260113229.pdf
    • https://cdn.shopify.com/s/files/1/0432/4157/0466/files/89797564401.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_off0000615f.bin
e9adfcb37a89c8189e20d6ad0ea18303e325606eb8a0507ccf214ef3451a1a0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x615F 5332 bytes
font_01_sfnt_off00007385.bin
e53d8d8805fbf36a5b95c2df001fda6102b2ef2cc5eb695ca005fc5fd017e123		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7385 10096 bytes

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