Malicious PDF — malware analysis report

Static analysis result for SHA-256 3720f8f82c59d9ce…

MALICIOUS

PDF

51.0 KB Created: 2020-07-27 20:39:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8b38bd8649f717753b11c656a3d1bd9 SHA-1: f56ed49928c5a32ec5a3c8e28b7f9742199117a7 SHA-256: 3720f8f82c59d9ce7cab872ed39a60a2615fd07a89dfb9b4103978613d358ace
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure for a game hack ('hungry shark hack apk home'). The presence of numerous Shopify-hosted PDF links, likely part of a link farm, further supports a malicious distribution strategy. The ML classifier also strongly indicated maliciousness.

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=hungry+shark+hack+apk+home
    • http://files.elchristian.org/uploads/1/3/1/4/131454916/zuzis.pdf
    • http://files.cottonginmuseum.org/uploads/1/3/0/9/130969312/wewox.pdf
    • http://files.stmaryofzion.org/uploads/1/3/0/7/130776478/1585841.pdf
    • http://files.cottonginmu
    • https://cdn.shopify.com/s/files/1/0431/7731/2405/files/sepikulabi.pdf
    • https://cdn.shopify.com/s/files/1/0440/1859/8038/files/61912790211.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/welilavuruwad.pdf
    • https://cdn.shopify.com/s/files/1/0435/7239/6193/files/jawemovolepiwaxaxuravike.pdf
    • https://cdn.shopify.com/s/files/1/0432/9691/5621/files/50982047028.pdf
    • https://cdn.shopify.com/s/files/1/0432/1184/9890/files/nipowuveguxed.pdf
    • https://cdn.shopify.com/s/files/1/0432/6427/8686/files/90834289531.pdf
    • https://cdn.shopify.com/s/files/1/0429/4030/1478/files/28321438630.pdf
    • https://cdn.shopify.com/s/files/1/0440/5500/3286/files/61692197115.pdf
    • https://cdn.shopify.com/s/files/1/0438/1271/6701/files/fajaziwokubugiji.pdf
    • https://cdn.shopify.com/s/files/1/0433/9764/4444/files/lisur.pdf
    • https://cdn.shopify.com/s/files/1/0431/4116/9303/files/serinoxanikefepido.pdf
    • https://cdn.shopify.com/s/files/1/0434/9168/8610/files/remewujozetup.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3545/files/25336844554.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_off00008117.bin
c51032971f00d2309f14cb5d71b0d62b71c18cf1768832dd1ead2e2c35835f34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8117 5196 bytes
font_01_sfnt_off0000927b.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x927B 1800 bytes
font_02_sfnt_off00009b09.bin
b49676c7005f51c585e39aa2dd501ae90ab95a61bdb49b91750609d3edc36be0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B09 10308 bytes

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