Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c152cc98a0afde…

MALICIOUS

PDF

53.9 KB Created: 2020-08-14 12:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6dff7657d2d2c28f47dad3749e504b7 SHA-1: 8382e0cdc9f7797d1cec18645b7e863248ad9d18 SHA-256: d7c152cc98a0afde2de905c197f5cb9750e4ecd4826eb9a881309139668d66b1
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically a URL designed to lure users with a driver download pretext. The document body, though partially corrupted, contains the URL 'https://ttraff.com/pify?keyword=asus+x555ld+drivers', reinforcing the lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, likely for SEO manipulation or to host further malicious content. No scripts were extracted from this sample.

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=asus+x555ld+drivers
    • http://files.boquetenewcomers.com/uploads/1/3/2/3/132302999/wasubulise_tidenunukuso_solud_subidanutejoji.pdf
    • http://mibekojuj.cmprecruitmentspecialist.com.au/uploads/1/3/0/7/130776213/bekajojoge.pdf
    • http://files.qianay.com/uploads/1/3/2/8/132814518/tukebutog.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1357/files/lasofimafiwapas.pdf
    • https://cdn.shopify.com/s/files/1/0445/7195/1268/files/17622050886.pdf
    • https://cdn.shopify.com/s/files/1/0436/9884/7894/files/piraxikisevolafu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/74098669839.pdf
    • https://cdn.shopify.com/s/files/1/0433/7532/9441/files/32916561949.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bizem.pdf
    • https://cdn.shopify.com/s/files/1/0431/0394/4858/files/nubisimojagaxowubivile.pdf
    • https://cdn.shopify.com/s/files/1/0430/0426/4602/files/31912974675.pdf
    • https://cdn.shopify.com/s/files/1/0435/5109/6993/files/ginadijobikadibagira.pdf
    • https://cdn.shopify.com/s/files/1/0433/7431/3621/files/minor_cofactor_and_adjoint_of_a_matrix.pdf
    • https://cdn.shopify.com/s/files/1/0436/5156/3670/files/saxon_algebra_2_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/4411/9462/files/beauty_s_release_download.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_off0000815b.bin
8b10938b84633be886f4e5859bd3394451f65122055606777eda4ab881078c0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x815B 4848 bytes
font_01_sfnt_off000091f3.bin
2b7aedbd3ff7d6a99f3939bd6258b86c51e104edb010ed3e1397037f4d21a7b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91F3 10224 bytes
font_02_sfnt_off0000b535.bin
36298d9b42482ef505b651e9545134b76438dad7e59d1f17d96a2cc3761d4b83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB535 16304 bytes

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