Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f7874e9c0c76cf…

MALICIOUS

PDF

41.2 KB Created: 2020-08-12 19:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27cc05b40e267d4cdec8226a029a956b SHA-1: 8ed08d4638900d17cea55a56e5b4edc2583c471f SHA-256: c1f7874e9c0c76cf9bbb61a4a143ee1913a6aa8c4fcc02b58f82a31530ac34b0
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 'https://ttraff.cc/wb?keyword=test%20psicometrico%20del%20dibujo%20del%20arbol%20pdf'. This URL is presented within the document body as a test, aiming to lure the user into clicking it. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to distribute 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/wb?keyword=test%20psicometrico%20del%20dibujo%20del%20arbol%20pdf
    • http://files.statebirdtogo.com/uploads/1/3/2/7/132710687/a1b067.pdf
    • http://files.foothillsrh.org/uploads/1/3/1/4/131411596/gonepodigazom.pdf
    • http://files.speedcitysistersincrime.org/uploads/1/3/2/7/132710491/vubojibalulapidaxazi.pdf
    • http://files.balwynhighschool1957to1962reunion.org/uploads/1/3/1/0/131070529/kunegelaru-pajit-forijasugazepo-lirilodadisixew.pdf
    • https://cdn.shopify.com/s/files/1/0432/7827/0619/files/34766950138.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/tournament_bracket_maker.pdf
    • https://cdn.shopify.com/s/files/1/0431/5879/8492/files/free_career_test_for_high_school_students.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/fozofupi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0470/6464/files/gate_2020_ee_solved_paper.pdf
    • https://cdn.shopify.com/s/files/1/0432/3521/3467/files/xaromo.pdf
    • https://cdn.shopify.com/s/files/1/0438/9994/5112/files/breathe_fresh_yd-_706_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5965/files/8345653304.pdf
    • https://cdn.shopify.com/s/files/1/0431/1895/2612/files/91783511437.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89186344985.pdf
    • https://cdn.shopify.com/s/files/1/0431/9323/7665/files/los_cuatro_acuerdos_sabiduria_tolteca.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_off0000618a.bin
97d344a99d82ee82c7f0044c35d5c333fa798703095eb8a0e6b3c1a32cc6acad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x618A 5464 bytes
font_01_sfnt_off00007408.bin
ea031f5b49ff5462f33c0b03757c14e5eab2bb6347972e5379e6d585d99a94f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7408 10380 bytes

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