Malicious PDF — malware analysis report

Static analysis result for SHA-256 649b3b8ad810e4e6…

MALICIOUS

PDF

52.0 KB Created: 2020-08-12 19:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e019657ef4d950c635ecc5fd64f70f6 SHA-1: c1f64f84ea90f9457ce770a06a7974444daff6c2 SHA-256: 649b3b8ad810e4e69f13224744b29930e3793879299de8235c19fc84c1f017ce
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting an attempt to manipulate search engine results or lure users to malicious sites.

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=pdf%20of%20sum%20of%20two%20independent%20random%20variables
    • http://files.hypnosismo.com/uploads/1/3/1/6/131637658/8336815.pdf
    • http://files.greengardendiva.com/uploads/1/3/0/7/130776118/xugediz.pdf
    • http://palozet.southmainbbq.com/uploads/1/3/1/1/131163864/jizaxufis.pdf
    • http://fibeguje.codsallhistory.com/uploads/1/3/1/8/131871674/punekuluxeriwimuxam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/6356/5727/files/68799412837.pdf
    • https://cdn.shopify.com/s/files/1/0430/7678/0192/files/achilles_tendon_stretching_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0429/3387/8940/files/refimodifexonud.pdf
    • https://cdn.shopify.com/s/files/1/0435/5935/4517/files/am_i_evil_tab.pdf
    • https://cdn.shopify.com/s/files/1/0429/7709/9935/files/nefixeruw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87277754858.pdf
    • https://cdn.shopify.com/s/files/1/0429/3902/3526/files/gsa_calendars_2016.pdf
    • https://cdn.shopify.com/s/files/1/0430/4325/8519/files/92345470991.pdf
    • https://cdn.shopify.com/s/files/1/0439/9448/0798/files/temoxalefut.pdf
    • https://cdn.shopify.com/s/files/1/0432/0667/2546/files/33147881561.pdf
    • https://cdn.shopify.com/s/files/1/0448/3081/8461/files/williams_hematology_6th_edition.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_off00006f43.bin
9ffb5c212bfb682f6063da5f22f6e1773be1827ce11dc18348b9dcfa41894d10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F43 5364 bytes
font_01_sfnt_off0000816e.bin
90f695bbc8c5b856db743d275f2e48d3d2e5d5241cb0de98fce51826a30fd6b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x816E 16440 bytes
font_02_sfnt_off0000b4ce.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CE 4324 bytes

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