Malicious PDF — malware analysis report

Static analysis result for SHA-256 af385cc8092f81dc…

MALICIOUS

PDF

40.5 KB Created: 2020-07-11 17:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d499695cb4c6df3ea7ad63ee8022e814 SHA-1: a8fbc6a22a775daf09c8fe5742c6795d440d6ad3 SHA-256: af385cc8092f81dc8613a0cd26c43c527f626571846efacb02b34b80165c177e
152 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains. The primary link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to academic topics, likely serving as a lure to disguise the malicious intent of the embedded links. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to redirect users to potentially harmful content.

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.com/wb?keyword=division%20of%20labor%20in%20society%20durkheim%20pdf
    • http://files.villavidalocamarket.com/uploads/1/3/1/4/131438682/mejobona_pepurumiferezo.pdf
    • http://files.thirdcinemaproductions.com/uploads/1/3/1/3/131379749/sonazez.pdf
    • http://files.paintedbuttonquail.com/uploads/1/3/1/0/131070045/nazurigobavul.pdf
    • http://files.littlebitofheavenadoptionreferral.com/uploads/1/3/1/4/131407292/73b36.pdf
    • http://files.completeserviceokc.com/uploads/1/3/2/7/132740501/xebejitepipin.pdf
    • http://files.candycoatedcircus.com/uploads/1/3/2/6/132695668/tamanusupes.pdf
    • http://files.whitepeacockcoffee.com/uploads/1/3/1/4/131436971/7dad80.pdf
    • http://files.milanibowhunting.com/uploads/1/3/1/8/131855992/b16a699.pdf
    • http://files.daydreamandwonder.com/uploads/1/3/1/3/131380850/e45e13e.pdf
    • https://wajosub.files.wordpress.com/2020/07/96562405670.pdf
    • https://nefirizawira.files.wordpress.com/2020/06/latowigirexelibo.pdf
    • https://puzotineper.files.wordpress.com/2020/07/pilinesijujamesakuvo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30899714004.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/zipefukaguzilezebabemes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/59022585862.pdf
    • https://cdn.shopify.com/s/files/1/0431/2226/2178/files/lovaxepos.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42386580717.pdf
    • https://cdn.shopify.com/s/files/1/0427/4801/8855/files/wiladewokex.pdf
    • https://cdn.shopify.com/s/files/1/0431/2888/1313/files/48916301013.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_off00006010.bin
4ce4ef868d0a5551f2d790fc4c1c31ec616afaf0813c6593331c6b14dc28f296		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6010 5640 bytes
font_01_sfnt_off00007314.bin
12df46c2156f53b70325fc0ba9ef19e9acf78c2c52721735821b1893bca77281		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7314 9904 bytes

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