Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37f539d61a294cb…

MALICIOUS

PDF

44.8 KB Created: 2020-08-31 07:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38c60c29e211f26f15e2c422a1077148 SHA-1: 03a6e19a1bd3fbec23e8cec14411bc00ae6c0311 SHA-256: a37f539d61a294cb6b8ef5e5b95f91c8be7d9ce6e98757bd64cd7dae9341595a
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/wix?keyword=download+film+aadc+2+lk21'. Additionally, it exhibits a PDF link farm heuristic, with numerous links pointing to Shopify domains, one of which is 'https://cdn.shopify.com/s/files/1/0431/0515/7282/files/97521258465.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body contains obfuscated text and the malicious URL, suggesting an attempt to disguise the 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=download+film+aadc+2+lk21
    • https://cdn.shopify.com/s/files/1/0431/0515/7282/files/97521258465.pdf
    • https://cdn.shopify.com/s/files/1/0440/1384/6693/files/betovixote.pdf
    • https://cdn.shopify.com/s/files/1/0435/8999/2605/files/98494350994.pdf
    • https://cdn.shopify.com/s/files/1/0454/0537/2584/files/animal_cell_culture_biotechnology.pdf
    • https://cdn.shopify.com/s/files/1/0428/4982/9023/files/55095135633.pdf
    • https://cdn.shopify.com/s/files/1/0437/6608/7832/files/90026926067.pdf
    • https://cdn.shopify.com/s/files/1/0429/7015/3113/files/zupowabipupokegoz.pdf
    • https://cdn.shopify.com/s/files/1/0427/9985/7823/files/spatial_reasoning_questions.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0234/files/29665072810.pdf
    • https://cdn.shopify.com/s/files/1/0437/8827/1777/files/radavanizedonatufiroti.pdf
    • https://static.usrfiles.com/ugd/cf79db_8ba2605fcd6244a899cdf2fcaad9d2d7.pdf
    • https://static.usrfiles.com/ugd/5de1df_ba1fe58ace9d47edad00c17a37220294.pdf
    • https://static.usrfiles.com/ugd/bf0735_6d989d766af048fe854cde40d8b43e2a.pdf
    • https://static.usrfiles.com/ugd/ee9d3f_ea40668197b848548b7328fcd1de10d5.pdf
    • https://static.usrfiles.com/ugd/9757e7_f656444288ec425a94fc475bbd778d96.pdf
    • https://cdn.shopify.com/s/files/1/0430/1409/5001/files/calculator_windows_10_offline_installer.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9462/files/canon_canoscan_lide_300_driver.pdf
    • https://cdn.shopify.com/s/files/1/0435/1908/2651/files/91661156164.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zukukujumifuxutage.pdf
    • https://cdn.shopify.com/s/files/1/0427/9658/1020/files/lomazejakepi.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_off000065b0.bin
a5b59bc34766a656a108ef09c0de5a605cdc8ff7d5255611ef0b36eda05ebb6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B0 4824 bytes
font_01_sfnt_off00007612.bin
23653f2873024d811af9d506f978b11efc6d431bcd0b2340b1b2ba03d06d93c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7612 9992 bytes
font_02_sfnt_off0000983f.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x983F 4324 bytes

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