Malicious PDF — malware analysis report

Static analysis result for SHA-256 29428c7a56136982…

MALICIOUS

PDF

46.9 KB Created: 2020-08-31 16:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f408e57fdbf4d2eb37a6a3282b284255 SHA-1: cbf41ee2a057c2c53e045aa5543f06d938423b38 SHA-256: 29428c7a56136982f0978860ceae895d412c772380e275881e2ab36248cd4d36
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and heuristic analysis. It contains a mass of external links, many pointing to benign Shopify domains, but crucially includes a link to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, contains the same malicious URL, suggesting a lure to a phishing or malware distribution site. No scripts were extracted, but the presence of the malicious redirector is sufficient evidence of malicious intent.

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=aicpa+agreed+upon+procedures+report+example
    • https://cdn.shopify.com/s/files/1/0448/3537/3213/files/chalte_chalte_movie_all_video_song.pdf
    • https://cdn.shopify.com/s/files/1/0429/4203/8172/files/anne_of_green_gables_novel.pdf
    • https://cdn.shopify.com/s/files/1/0437/4354/3447/files/ghatna_chakra_purvavlokan_series_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0440/6296/5912/files/66360417654.pdf
    • https://cdn.shopify.com/s/files/1/0437/6641/5517/files/cursive_alphabet_writing_practice_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0436/8911/5801/files/94706510419.pdf
    • https://cdn.shopify.com/s/files/1/0428/4809/2323/files/crossfit_open_20._4_score_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/nudivukodowemobip.pdf
    • https://cdn.shopify.com/s/files/1/0431/6345/1549/files/bazofemibewozorax.pdf
    • https://cdn.shopify.com/s/files/1/0432/4111/1716/files/suramukuzenulokonumojiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/3669/6999/files/41442555387.pdf
    • https://cdn.shopify.com/s/files/1/0432/2482/6014/files/40047534412.pdf
    • https://cdn.shopify.com/s/files/1/0432/4206/1986/files/english_placement_test_online_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/the_merciless_danielle_vega_read_onl.pdf
    • https://cdn.shopify.com/s/files/1/0431/5634/0890/files/vevubasajegavetakulere.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_off000079a0.bin
75c7bd4e60247a56a0c503dcc2a0aece9958b0edaff25924968a04c3ae16b019		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79A0 5452 bytes
font_01_sfnt_off00008c18.bin
002bc25d4dcb4b91805b428b4dceac1c5cf1d3684ac75648c7852d69fcd9cddd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C18 10040 bytes

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