Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68aae55739fab07…

MALICIOUS

PDF

48.0 KB Created: 2020-08-12 15:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e12914c414cdcba0f7cb078493dccd6 SHA-1: 9c5971c61eca2c56608d4cf8e12e23e54170a5cb SHA-256: c68aae55739fab072c568eea50b9b4b81e1e4104abdc37c5994780245da2b833
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious redirector and the link farm strongly suggest a malicious intent to lure users to harmful sites.

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=bee+gees+how+deep+is+your+love+sheet+music+pdf
    • http://bogim.bespokeoff-road.com/uploads/1/3/1/3/131380429/9b2c1307.pdf
    • http://files.moriahgracephotography.com/uploads/1/3/1/4/131453045/vetesowitip.pdf
    • http://vivemoso.churchstreetmarket.com/uploads/1/3/1/8/131858661/xewezonaxo-zikuvo-wamafidamefasaj.pdf
    • http://files.demolitioninsanantonio.com/uploads/1/3/0/7/130776341/522113.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/atari_2600_facebook_homebrew.pdf
    • https://cdn.shopify.com/s/files/1/0433/8358/6974/files/6661147185.pdf
    • https://cdn.shopify.com/s/files/1/0430/4837/0333/files/rupuxanun.pdf
    • https://cdn.shopify.com/s/files/1/0435/5345/6289/files/autodesk_fusion_360_tutorial_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0434/4024/2840/files/62535435508.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/texirid.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0835/files/pikagosinepepe.pdf
    • https://cdn.shopify.com/s/files/1/0432/7918/8118/files/pusoseruvux.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31903895201.pdf
    • https://cdn.shopify.com/s/files/1/0434/1979/5623/files/built_up_edge.pdf
    • https://cdn.shopify.com/s/files/1/0433/9059/9319/files/bobodiveluzobuvisatetap.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0767/files/pipexazejavutepezanebuj.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_off00007957.bin
ade9c9b318687f6c3120f38da239e5c3b4f98d574b5675d9af7dbdba6b7c81ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7957 5660 bytes
font_01_sfnt_off00008c9e.bin
18d1ab7f70f3d1a5e35f1f04d06e90275910f00227d02e5a821a20323e30f81e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C9E 10992 bytes

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