Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca846c511e0ea33a…

MALICIOUS

PDF

47.9 KB Created: 2020-08-10 09:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2abb282ec6a7a6738a43715959a98d1a SHA-1: 83bf4d05cbd423eb05c6a695b43a636530ca21a6 SHA-256: ca846c511e0ea33a992b02a370a7c5d3c1c4084fa99b861ba5c80ea61286c627
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily corrupted, contains text related to 'medicine names and uses in telugu pdf' and the wkhtmltopdf application, suggesting a lure to disguise the malicious intent. The primary attack pattern involves redirecting the user to malicious infrastructure via a link farm.

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/pify?keyword=medicine+names+and+uses+in+telugu+pdf
    • http://files.bizraeli-anglo.com/uploads/1/3/1/6/131606397/764548.pdf
    • http://files.biophysical-ecology.com/uploads/1/3/1/4/131406356/xivut_girusidusowele_finusagon.pdf
    • http://files.thelaurenwalker.com/uploads/1/3/1/3/131380741/revari.pdf
    • http://files.fortclarkdays.org/uploads/1/3/0/7/130739517/kulavozowabuzunegisu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7793/5004/files/dalixiweg.pdf
    • https://cdn.shopify.com/s/files/1/0431/3989/1357/files/calendario_lunare_capelli_gennaio_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuxovozukirofavekejob.pdf
    • https://cdn.shopify.com/s/files/1/0432/4678/0566/files/minecraft_repair_and_disenchant.pdf
    • https://cdn.shopify.com/s/files/1/0432/0228/1633/files/vebitewavo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/asnt_level_iii_study_guide_basic_revision_third_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/9074/7293/files/gokupojuvarifutebiximudo.pdf
    • https://cdn.shopify.com/s/files/1/0440/3865/2054/files/aspergers_aq_test.pdf
    • https://cdn.shopify.com/s/files/1/0434/6878/3766/files/punititom.pdf
    • https://cdn.shopify.com/s/files/1/0432/3262/4808/files/dadogesadafiruxaragap.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_off000066dc.bin
e9d4ee14dc8ab61beeeec83872bea89e9aa89917486aa00d03218a4fb43fd2a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66DC 5156 bytes
font_01_sfnt_off00007854.bin
68bcfd024f4a43538fc64bea038568238dd51e8d982a6786350b665288fbc4aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7854 14292 bytes
font_02_sfnt_off0000a471.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA471 4324 bytes

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