Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bcb0c078e51a1b…

MALICIOUS

PDF

44.5 KB Created: 2020-08-13 21:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19ac5d2f9d8e9cab6a08dae1456ef05a SHA-1: f923116f6a3a6294a56fc9a4fb346d426bd5cf56 SHA-256: 90bcb0c078e51a1b0eb92c78abb5213b3c257435ee571b9054b87df4cbe91aed
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though partially corrupted, contains text related to 'classifying rational numbers worksheet lesson 2- 1' and the malicious URL. This suggests a lure to trick users into clicking the malicious link, which is likely intended to download further malicious content or redirect to a phishing site. The presence of a large number of external PDF links also indicates a link farm, a common tactic for SEO poisoning or distributing malicious content.

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=classifying+rational+numbers+worksheet+lesson+2-+1
    • http://giler.kaprentals.com/uploads/1/3/1/4/131453215/2513830.pdf
    • http://foremosi.searchlightorganization.com/uploads/1/3/2/8/132814930/dimodu.pdf
    • http://files.beyondthelearningcurve.com/uploads/1/3/1/0/131070035/josuwu-beleb-paramazakulav.pdf
    • http://fibusuk.tabasrosen.com/uploads/1/3/0/7/130776299/c4b559c764a84b.pdf
    • https://cdn.shopify.com/s/files/1/0436/6182/0054/files/42364851149.pdf
    • https://cdn.shopify.com/s/files/1/0432/9970/0889/files/rokajudirorakigoreb.pdf
    • https://cdn.shopify.com/s/files/1/0434/4617/3852/files/physics_4th_edition_walker_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0432/7407/6315/files/club_penguin_codes_for_hair_2016.pdf
    • https://cdn.shopify.com/s/files/1/0435/7931/0239/files/8_ball_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/wajobidoke.pdf
    • https://cdn.shopify.com/s/files/1/0431/8799/4792/files/75120140863.pdf
    • https://cdn.shopify.com/s/files/1/0444/1381/2903/files/john_deere_214_parts_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0440/6145/8582/files/gezuweb.pdf
    • https://cdn.shopify.com/s/files/1/0430/6426/2818/files/52836170425.pdf
    • https://cdn.shopify.com/s/files/1/0430/0357/6481/files/cheats_for_the_forest.pdf
    • https://cdn.shopify.com/s/files/1/0431/5453/8658/files/97644316044.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1920/files/juworidejatev.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_off00006ac1.bin
bae2eb16ee679be68cdb6bde7345219a9e99419cb43330cf0e70031b3b343b06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC1 5700 bytes
font_01_sfnt_off00007e2d.bin
74516b05b03addb91036b4256f1f34f2893f4d1c1d97a0732735deea3011a4f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E2D 11196 bytes

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