Malicious PDF — malware analysis report

Static analysis result for SHA-256 e48a991da5ccb2d2…

MALICIOUS

PDF

37.1 KB Created: 2020-08-09 05:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5e3aea9433042910bfd18b241610154 SHA-1: 099833c6e4a16825a783b3295e9afec9d988dad1 SHA-256: e48a991da5ccb2d28d02c75f8bd11dd197fe3a2c9bd26453e48564ef4c066208
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though partially corrupted, includes text suggesting it's a worksheet, a common lure. The presence of numerous external links, many hosted on Shopify, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it's designed to redirect users to malicious infrastructure.

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=solve+and+graph+compound+inequalities+worksheet+pdf
    • http://vobazo.seoulvibephangan.com/uploads/1/3/1/4/131453541/likaj-towopu-dedoxulekipes-pelivavivav.pdf
    • http://files.rosslynpublishers.com/uploads/1/3/0/8/130814295/8100438.pdf
    • http://files.jansceramic.com/uploads/1/3/2/7/132740633/xowopa.pdf
    • https://cdn.shopify.com/s/files/1/0441/4259/2152/files/5412432669.pdf
    • https://cdn.shopify.com/s/files/1/0430/0714/8185/files/front_page_mag.pdf
    • https://cdn.shopify.com/s/files/1/0432/2272/8866/files/wufoxavaxorozesujabuku.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7392/files/canopus_in_argos.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0514/files/41812480964.pdf
    • https://cdn.shopify.com/s/files/1/0433/9843/0876/files/pdf_auditoria_contabil.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/takapisil.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2384/files/bhagavad_gita_sadhak_sanjivani_english_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/dumilafabubevavirafan.pdf
    • https://cdn.shopify.com/s/files/1/0431/8694/6212/files/pavugigufugalikanatup.pdf
    • https://cdn.shopify.com/s/files/1/0440/8157/8136/files/volegomapinubepego.pdf
    • https://cdn.shopify.com/s/files/1/0433/3839/9912/files/610850838.pdf
    • https://cdn.shopify.com/s/files/1/0432/2351/5294/files/risokikimazuxugekozuzujax.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_off000051c3.bin
a326425b7924c643d22bc562985e38e528390134b00b923da33d81f7581c4188		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51C3 6012 bytes
font_01_sfnt_off00006625.bin
98e1f1e5c049549f0dc217c13279cbf81df95ffb007972148184c0294260a82c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6625 9676 bytes

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