Malicious PDF — malware analysis report

Static analysis result for SHA-256 be098ac3a728ffb9…

MALICIOUS

PDF

49.2 KB Created: 2020-08-18 20:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfd1ae7c8c93ba3915ecf50dce8eb246 SHA-1: 156a7d4396b5f3fa4beadd513a40374322b931fc SHA-256: be098ac3a728ffb94440290e5d5590af87fad78da544556e6b02a0e7bbeab3e3
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to 'Bstc 2018 paper answer sheet' to entice users to click the malicious URL. The presence of a link farm and a malicious redirector indicates a phishing or scam attempt.

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=bstc+2018+paper+answer+sheet
    • http://foduxow.hotchocolatedispensers.com/uploads/1/3/2/3/132302780/27da255.pdf
    • http://files.christinemcahill.com/uploads/1/3/1/6/131636772/limoloragup.pdf
    • http://files.drawingonmusic.com/uploads/1/3/1/0/131070044/mupesibudunug-womexezaluzo.pdf
    • http://files.tapapacifica.com/uploads/1/3/1/8/131856065/3020745.pdf
    • https://cdn.shopify.com/s/files/1/0434/6229/5716/files/mitisusuxagogapife.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9176/files/lutunisofunujixosorojego.pdf
    • https://cdn.shopify.com/s/files/1/0431/1387/3569/files/bugofiselapoxawifub.pdf
    • https://cdn.shopify.com/s/files/1/0434/1222/6202/files/61955017780.pdf
    • https://cdn.shopify.com/s/files/1/0433/2548/9305/files/sahih_al_bukhari_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0434/6000/1945/files/jibuwuzozazawunawunuwub.pdf
    • https://cdn.shopify.com/s/files/1/0432/8049/8852/files/teenage_athlete_meal_plan.pdf
    • https://cdn.shopify.com/s/files/1/0434/3712/9895/files/californian_fb-_reg_font.pdf
    • https://cdn.shopify.com/s/files/1/0430/6678/5953/files/96530326970.pdf
    • https://cdn.shopify.com/s/files/1/0437/8705/9362/files/80886730282.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005925.bin
7d374d42bdbc45fcf793db69795fc978a8fa984bbb4603917bd89f328118c734		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5925 5648 bytes
font_01_sfnt_off00006c69.bin
d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C69 3720 bytes
font_02_sfnt_off000077cc.bin
258da9bc11a99bfe9a840f69be316a484b54f3593468086ec98e763047c82f90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77CC 9852 bytes
font_03_sfnt_off000099e0.bin
b0268f1577229b3fc226d4a2983f035ce7220a249f2f37fcadc6e411374e360b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99E0 8996 bytes

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