Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e4a25781e73b87…

MALICIOUS

PDF

43.9 KB Created: 2020-08-24 18:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 663761357b92c6c5133fb0b1b38ad3a0 SHA-1: b315cf53e2d106d6d6b9bf67269d40f730d07b9f SHA-256: 33e4a25781e73b879bf15e7d86610f97d0b0477042b461152eda4092a7eb52b2
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document impersonates a cloud document lure, attempting to trick users into clicking embedded links. One of these links, 'https://ttraff.cc/pify?keyword=asus+file+manager+cracked+apk', leads to known malicious redirector infrastructure. The document also contains a large number of links to PDFs hosted on Shopify, some of which are benign but others are hosted on unknown domains, suggesting a link farm or SEO poisoning tactic. No scripts were extracted, but the presence of malicious redirectors and the cloud document lure pattern indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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=asus+file+manager+cracked+apk
    • http://xekib.sharkydogchews.com/uploads/1/3/0/7/130776394/natofexajelat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0461/8148/2649/files/bomapololanumi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8110/4541/files/ipad_annotate_apple_pencil.pdf
    • https://cdn.shopify.com/s/files/1/0431/6381/2004/files/xepolitofujufu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7790/3263/files/chubb_life_science_proposal_form.pdf
    • https://cdn.shopify.com/s/files/1/0451/3621/6229/files/how_to_convert_kelvin_to_fahrenheit.pdf
    • https://cdn.shopify.com/s/files/1/0428/6568/8743/files/80045429865.pdf
    • https://cdn.shopify.com/s/files/1/0428/4930/4732/files/hemoptysis_evaluation_and_management.pdf
    • https://cdn.shopify.com/s/files/1/0429/2250/8454/files/lilapisefoginibisinewug.pdf
    • https://cdn.shopify.com/s/files/1/0428/8013/9423/files/88866988991.pdf
    • https://cdn.shopify.com/s/files/1/0432/9383/5432/files/fegakenomidupufasomowure.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005575.bin
8b57419ff22ffd9360c2f782bc8922688d60b44e0ea7b43c81fd03a386985e5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5575 5220 bytes
font_01_sfnt_off00006713.bin
0a51b86916397204b56e66d70900de84e13f9a915d2a046768d76feb6633ea60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6713 16348 bytes
font_02_sfnt_off00009539.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9539 4324 bytes

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