Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea6380dea7fda41…

MALICIOUS

PDF

49.2 KB Created: 2020-08-06 21:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efe3bc625ef7b82fb4d5831f588c338b SHA-1: 9e2c0eac1b34c32add5e990d6bd7e83515ccb0b3 SHA-256: 4ea6380dea7fda4166c918601ba70d0a743d8160d5c943429ade4168368091e5
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic identifying it as a link farm pointing to known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.cc/pify?keyword=sejarah+belanda+masuk+ke+indonesia+pdf. While the document body contains garbled text, the presence of numerous external links, including one to a Shopify domain, strongly suggests a redirection-based attack. The ML classifier also provided a very high confidence score for 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=sejarah+belanda+masuk+ke+indonesia+pdf
    • http://files.theaterfreunde-siders.ch/uploads/1/3/0/8/130814390/temeragifefu.pdf
    • http://pejevaba.corsicanamainstreet.org/uploads/1/3/1/3/131379732/mawowomuletov.pdf
    • http://files.jackiedeephotography.com/uploads/1/3/1/4/131438240/6026194.pdf
    • http://files.creativecounselingsrq.org/uploads/1/3/2/7/132710787/5366484.pdf
    • http://files.beautyboxbytatiana.com/uploads/1/3/2/3/132303092/e348afd.pdf
    • https://cdn.shopify.com/s/files/1/0427/9504/0924/files/tekegenodapoxizur.pdf
    • https://cdn.shopify.com/s/files/1/0434/8208/7588/files/51038920745.pdf
    • https://cdn.shopify.com/s/files/1/0431/1855/9393/files/50534026024.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30551251375.pdf
    • https://cdn.shopify.com/s/files/1/0432/4609/2443/files/jelunogav.pdf
    • https://cdn.shopify.com/s/files/1/0439/3825/0910/files/blink-_182_cheshire_cat.pdf
    • https://cdn.shopify.com/s/files/1/0432/1227/5870/files/lukozogodalusemez.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nemubowakupupoda.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/takuz.pdf
    • https://cdn.shopify.com/s/files/1/0439/9579/1518/files/49942781321.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45484104345.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_off0000738e.bin
86a52687d986039f4c5b32e396b4e3a4dc6cc74b7fe698eb7997b60a97e8d63b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x738E 5468 bytes
font_01_sfnt_off000085e6.bin
447832576429a496bbd3678e28829f714cbed273ca7274dbe39180fe0d3cbad6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85E6 9748 bytes
font_02_sfnt_off0000a748.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA748 4324 bytes

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