Malicious PDF — malware analysis report

Static analysis result for SHA-256 555a0ce818e3c07e…

MALICIOUS

PDF

33.6 KB Created: 2020-08-17 04:39:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7e4a74184b6b31db6299a2d9fa739d0 SHA-1: 486977a282511cdd77974ec91868cfcc4c8e6f54 SHA-256: 555a0ce818e3c07e316b823521827a7ab9a1730fbeafd0b0278492f08702fb30
150 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, specifically pointing to a lure for a Call of Duty APK. The document body, though heavily obfuscated, contains the same URL. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm used for SEO poisoning or to obscure the final malicious destination. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=apk+call+of+duty+apkpure
    • http://files.dreifert.com/uploads/1/3/1/6/131636655/fudoji-dasuvazifu-dazurutowu-febate.pdf
    • http://xukego.lisassalonspa.com/uploads/1/3/1/0/131070588/3ad1677.pdf
    • http://gutareg.easy1upbusiness.net/uploads/1/3/0/9/130969192/108257d.pdf
    • http://kesopape.txstang.com/uploads/1/3/0/7/130776688/zibawido-zadetum-zikazutinuwovu.pdf
    • http://zolubi.studio6works.com/uploads/1/3/2/6/132680813/kewelabolexabekukid.pdf
    • https://cdn.shopify.com/s/files/1/0433/6379/5096/files/fetolivikexaje.pdf
    • https://cdn.shopify.com/s/files/1/0436/3295/1446/files/retencion_placentaria_bovinos.pdf
    • https://cdn.shopify.com/s/files/1/0440/7836/6885/files/riloxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/1283/2931/files/30190448581.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4465/files/ridepafomudebiwefugi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9256/6435/files/java_abstract_class.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2691/files/67329414420.pdf
    • https://cdn.shopify.com/s/files/1/0440/6067/2165/files/tiwotis.pdf
    • https://cdn.shopify.com/s/files/1/0432/6935/7728/files/54158013120.pdf
    • https://cdn.shopify.com/s/files/1/0431/0233/9232/files/32559710806.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_off0000471b.bin
b0c512b64f22ccb2d651cd026afebc25eb361fbb464206f50cd3ee580f44f330		 pdf-font-stream PDF embedded font (sfnt) at offset 0x471B 5124 bytes
font_01_sfnt_off0000589f.bin
5865bd7c2615f467724a1c87bf997c08c87d2a3936cf0d59355bc25d4f664765		 pdf-font-stream PDF embedded font (sfnt) at offset 0x589F 9716 bytes

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