Malicious PDF — malware analysis report

Static analysis result for SHA-256 1085f590d4424ccc…

MALICIOUS

PDF

48.5 KB Created: 2020-08-07 06:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2f905edc975c15df650392769b29f35 SHA-1: ad5fb68c754aeb2da818a1eda98a04d2cd54769c SHA-256: 1085f590d4424ccc3e2fcd36c007568960be8f7dee6b72044525d2f7c0d0f35e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or redirection scheme. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=bank+success+fast+preparation+book+pdf', indicating a probable attempt to direct users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=bank+success+fast+preparation+book+pdf
    • http://files.enipma.com/uploads/1/3/1/4/131437017/xisakedujamula.pdf
    • http://files.michaelhisamoto.com/uploads/1/3/1/6/131606289/48395c0.pdf
    • http://files.belizehomesource.com/uploads/1/3/1/3/131380342/kejonepuwepokut_vabuzobajewut_pugekisan_doridakixuzijaf.pdf
    • http://files.allisondfredette.com/uploads/1/3/2/7/132740533/netilaxerares.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/20287494759.pdf
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/fuxapulafekab.pdf
    • https://cdn.shopify.com/s/files/1/0428/9655/6191/files/zusovegudevagur.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fuwemosuwizukuxitakalav.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/24592449118.pdf
    • https://cdn.shopify.com/s/files/1/0436/2154/8194/files/adobe_acrobat_to_word_converter_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/4778/8450/files/rikaluxosekirasuj.pdf
    • https://cdn.shopify.com/s/files/1/0429/7388/8671/files/bofukawokarut.pdf
    • https://cdn.shopify.com/s/files/1/0431/0132/3421/files/45801145010.pdf
    • https://cdn.shopify.com/s/files/1/0430/4338/9597/files/darasewepiwebavuto.pdf
    • https://cdn.shopify.com/s/files/1/0438/4597/6224/files/nekemezusejumofalem.pdf
    • https://cdn.shopify.com/s/files/1/0428/1548/8163/files/15591958368.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_off00006a2a.bin
48c0e0d1e71b3d6cf1398a81604023446c7421f0a98c12a578e656bfe4ea5322		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A2A 5368 bytes
font_01_sfnt_off00007c7d.bin
78ea4df4b5b04e2c9d9f7a42fa6c6d25b0c41aab8ba908d435dcad419eb188c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C7D 10556 bytes
font_02_sfnt_off0000a088.bin
e04ee983dbf1c9eed8665e60aadfdd8bbc0141cd992f8cd574bedec24386d72a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA088 5680 bytes

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