Malicious PDF — malware analysis report

Static analysis result for SHA-256 964f9a139fea1405…

MALICIOUS

PDF

51.6 KB Created: 2020-08-06 16:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eda077878b4ecfea5fba73258a941990 SHA-1: d5429c033fb3b279baa2bc77f3453e5367719b14 SHA-256: 964f9a139fea140546e605aa96cfa822f9dad73a3dfb4dc7eede5c686d4387bb
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector (ttraff.com). The document body, though heavily obfuscated, contains text related to "Bacterial culture procedure pdf" and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of numerous other PDF links, many hosted on cdn.shopify.com, indicates a potential link farm for SEO poisoning or to obscure the final malicious destination.

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=bacterial+culture+procedure+pdf
    • http://files.cherrycityfarms.com/uploads/1/3/2/6/132695294/4815102.pdf
    • http://files.hinsdalesouthathleticclub.org/uploads/1/3/1/3/131397934/nonasu-xizixivajufub-medelexa-xewavixeb.pdf
    • http://files.bishopgumbleton.com/uploads/1/3/1/3/131379371/tokasinipegog.pdf
    • https://cdn.shopify.com/s/files/1/0431/7904/9121/files/4890504518.pdf
    • https://cdn.shopify.com/s/files/1/0437/5419/3047/files/nafikuzefukej.pdf
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/95006109484.pdf
    • https://cdn.shopify.com/s/files/1/0438/1101/2770/files/52460330534.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/14526362047.pdf
    • https://cdn.shopify.com/s/files/1/0433/8951/7978/files/64182173399.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45598155969.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6352/files/autism_screening_test.pdf
    • https://cdn.shopify.com/s/files/1/0432/2282/7165/files/nizevuroto.pdf
    • https://cdn.shopify.com/s/files/1/0440/6630/8246/files/fukavuri.pdf
    • https://cdn.shopify.com/s/files/1/0435/9523/5490/files/tuzibuzuvifer.pdf
    • https://cdn.shopify.com/s/files/1/0429/5196/6873/files/83522985590.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_off00008082.bin
6e96f445d07bb2cb452be516950d945695d9ce423b9b4dd0f99339fef30b54ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8082 4796 bytes
font_01_sfnt_off000090de.bin
70cec5f0dfc5f49da620109111ff0b5264fdb0ed93841556edf07c1c8d4b2dbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90DE 10032 bytes
font_02_sfnt_off0000b311.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB311 4324 bytes

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