Malicious PDF — malware analysis report

Static analysis result for SHA-256 73012331cfc7e350…

MALICIOUS

PDF

46.7 KB Created: 2020-08-23 18:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 661c6ec949a22f16ed6ba67fd53e6df4 SHA-1: 031b19cc48bb796c19ae35919586c658da12fe86 SHA-256: 73012331cfc7e3503141a38e707e12c71ee8ea5d218ea249e1f89d103aa75ace
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm designed to attract users searching for specific technical information, such as 'check if worksheet exists excel vba'. This suggests a phishing or scamming attempt to redirect users to malicious sites.

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=check+if+worksheet+exists+excel+vba
    • http://files.irishdancect.com/uploads/1/3/0/9/130969507/jewimam_zutowawofela_pebemafofokegog_xazumujefowatin.pdf
    • http://ragorug.kupecservices.ca/uploads/1/3/1/4/131482995/4839534.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1419/2284/files/logitech_keybaord_disable_tap_to_click.pdf
    • https://cdn.shopify.com/s/files/1/0429/5891/3689/files/fesixewebufuxubiradut.pdf
    • https://cdn.shopify.com/s/files/1/0444/6031/0695/files/catan_seafarers_5_6_player_extension.pdf
    • https://cdn.shopify.com/s/files/1/0438/3830/8512/files/ios_beta_13_beta_7.pdf
    • https://cdn.shopify.com/s/files/1/0435/1465/8980/files/94585492687.pdf
    • https://cdn.shopify.com/s/files/1/0447/4391/7719/files/ejercicios_formulacion_alcanos_alquenos_alquinos.pdf
    • https://cdn.shopify.com/s/files/1/0439/2275/1643/files/56017989410.pdf
    • https://cdn.shopify.com/s/files/1/0434/4646/8769/files/molowebokubepulu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4781/3269/files/31429496986.pdf
    • https://cdn.shopify.com/s/files/1/0435/3320/5655/files/12610822279.pdf
    • https://cdn.shopify.com/s/files/1/0437/0956/3045/files/javascript_loop_through_object.pdf
    • https://cdn.shopify.com/s/files/1/0430/9729/2967/files/dunexuditikoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/hudson_park_bed_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0445/9456/1188/files/intimacy_anorexia_workbook.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078c4.bin
03db1badaae1bc74d0d248d369ff8a4e34ed5f9fcfb0f86504a02880041266da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78C4 5296 bytes
font_01_sfnt_off00008add.bin
ef8e2e383b9648d53f66a5e4b970ecc19dba6790ac9a036c3b4c0b932dd4ecc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ADD 10416 bytes

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