Malicious PDF — malware analysis report

Static analysis result for SHA-256 939d333a6b252b8f…

MALICIOUS

PDF

55.1 KB Created: 2020-08-11 20:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c77c164eb83c79988ce2c9154c1eda48 SHA-1: e0bd3c96e426991d380eb7583a1271f8f402e786 SHA-256: 939d333a6b252b8f6fbf58d98a9043f28136a0fdf4bc4b469756da9c5188c52b
152 Risk Score

Malware Insights

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

The PDF document was flagged by a critical heuristic for linking to known malicious redirector infrastructure. It also contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which is likely used to obscure the final destination of the attack, potentially leading to phishing or malware.

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.cc/pify?keyword=qaseeda+burda+shareef+urdu+pdf
    • http://files.dorianspebbleinapond.com/uploads/1/3/2/8/132816091/6139396.pdf
    • http://files.attractionmania.com/uploads/1/3/1/8/131857419/6afc07b.pdf
    • http://files.calclugston.com/uploads/1/3/0/7/130775431/japuzafojuted-tojofob.pdf
    • https://cdn.shopify.com/s/files/1/0450/6884/5208/files/buxabinubi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8838/0061/files/ribodu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/xopadidavixab.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/adwords_certification_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/6886/6212/files/44592688539.pdf
    • https://cdn.shopify.com/s/files/1/0429/7913/1551/files/87556026436.pdf
    • https://cdn.shopify.com/s/files/1/0428/1332/5471/files/porixemabifid.pdf
    • https://cdn.shopify.com/s/files/1/0435/6738/2687/files/ximolagipise.pdf
    • https://cdn.shopify.com/s/files/1/0438/1265/1170/files/28986784132.pdf
    • https://cdn.shopify.com/s/files/1/0435/9585/8088/files/24954119649.pdf
    • https://cdn.shopify.com/s/files/1/0433/4092/3048/files/artificial_intelligence_a_modern_approach_amazon.pdf
    • https://cdn.shopify.com/s/files/1/0436/4494/4542/files/bahra_lv_cables_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0432/5713/5257/files/zoligigirugozezifuwiz.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00009b3e.bin
6482701c455b5466a5bc096c006efb7c384b6dbf13d4c6f3ddd8cf5db654d83f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9B3E 21440 bytes
font_00_sfnt_off000067ab.bin
5ab5914d6cf96e02fa986a50b64a29d343b6e42de78fb9968964a28d6ac82081		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67AB 4836 bytes
font_01_sfnt_off00007815.bin
f05f7f4bf67f004a8a84639bdace51bb4c07d375fba49f8ef90f34f8227ad600		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7815 10440 bytes
font_03_sfnt_off0000c04a.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC04A 4324 bytes

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