Malicious PDF — malware analysis report

Static analysis result for SHA-256 b005791b1dc23260…

MALICIOUS

PDF

62.5 KB Created: 2020-07-30 23:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fba741e86293e889676e4d4f936ee250 SHA-1: 8c9b9240f19af68e227f03830c4ceb9c99328f39 SHA-256: b005791b1dc232606d081e0192eba8db54305094956c9c8b2eb523d5ee513df4
152 Risk Score

Malware Insights

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

The PDF contains a link farm with multiple embedded URLs, including a critical finding of a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its specific lure, but the presence of a link farm and malicious redirector points to a phishing or redirection attack. No scripts were extracted from this sample.

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.ru/pify?keyword=28+sda+fundamental+beliefs+pdf
    • http://files.roxierosekids.com/uploads/1/3/1/0/131070483/fovegareg.pdf
    • http://files.5049coastalcommunity.com/uploads/1/3/1/6/131636946/3176297.pdf
    • http://files.aedsa.ca/uploads/1/3/2/3/132303286/fatuwowifoveri.pdf
    • http://files.borrellgolf.com/uploads/1/3/1/3/131398475/miminonikefikur-sepisapubab-remubovenar.pdf
    • http://files.happyhorsefarm.net/uploads/1/3/0/7/130775201/41daa.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/42710522954.pdf
    • https://cdn.shopify.com/s/files/1/0429/1536/5020/files/37763549039.pdf
    • https://cdn.shopify.com/s/files/1/0432/3406/6594/files/43452498474.pdf
    • https://cdn.shopify.com/s/files/1/0431/2940/5600/files/64964422899.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jazaw.pdf
    • https://cdn.shopify.com/s/files/1/0438/9447/2856/files/mafisenelelozota.pdf
    • https://cdn.shopify.com/s/files/1/0430/2356/4957/files/gonezeko.pdf
    • https://cdn.shopify.com/s/files/1/0440/5110/3894/files/favibit.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/lefoxidokozukotikapumel.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/kavixopisepurupanuxis.pdf
    • https://cdn.shopify.com/s/files/1/0438/1566/5826/files/wozirarizebitukalawo.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_off0000afbf.bin
5583e7f48d82a7b5eca0216d943904502a1eead21dc3bdc119b15343015978e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBF 1560 bytes
font_01_sfnt_off0000b7bd.bin
13c305540e73fbcb95aac5c8e82537115bb024e808af0bdb6874011b73e060a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BD 5232 bytes
font_02_sfnt_off0000c957.bin
98d8b3cc8d2db34998d905ef47b2520f932998328823d584ab3f5ce70698b744		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC957 10248 bytes

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