Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb27908b94b79f0d…

MALICIOUS

PDF

45.6 KB Created: 2020-08-11 13:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14b2f0af6e6faba10a1de2088249fe19 SHA-1: 176c2c5ce42f53a2aa847172829a7811079569cb SHA-256: cb27908b94b79f0da8a3b637861ef0ff461e3c045c1865b79a8798cd94eb2a3a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or redirection strategy. One critical heuristic firing indicates a direct link to known malicious redirector infrastructure. The document body, though partially corrupted, contains the text 'Types of workplace harassment pdf' and the malicious URL, reinforcing the lure.

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=types+of+workplace+harassment+pdf
    • http://files.thinkinenglish.org/uploads/1/3/1/4/131406811/kifivegipifalas-sesanefafu.pdf
    • http://zobebori.chartwellprimarymaths.org.uk/uploads/1/3/0/8/130874359/zepezedajubipisuvo.pdf
    • http://files.mrsperkinsclassroom.com/uploads/1/3/0/7/130776104/vifanotugikixusabure.pdf
    • http://fogikudo.snugnut.com/uploads/1/3/0/9/130969060/mokolamejodij.pdf
    • http://files.frogityarns.com/uploads/1/3/2/8/132815172/pawafosi-siwasebozubatus-wulasas.pdf
    • http://files.frogityarns.com/uploads/1/
    • https://cdn.shopify.com/s/files/1/0449/1057/5771/files/guitar_scales_arpeggios.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/zijibewovufarejusa.pdf
    • https://cdn.shopify.com/s/files/1/0438/3070/6333/files/tivituzomored.pdf
    • https://cdn.shopify.com/s/files/1/0449/5346/9083/files/cbt_exercises_for_anxiety.pdf
    • https://cdn.shopify.com/s/files/1/0437/8827/1777/files/42695393360.pdf
    • https://cdn.shopify.com/s/files/1/0434/1058/7800/files/coyote_meat_wow_classic.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29480145432.pdf
    • https://cdn.shopify.com/s/files/1/0433/1615/0427/files/xurofifebuvemasek.pdf
    • https://cdn.shopify.com/s/files/1/0432/1368/4891/files/fawezexeruxika.pdf
    • https://cdn.shopify.com/s/files/1/0433/6818/6024/files/acid_base_and_salt_class_10_notes_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/8436/5476/files/romonetiziwatorawixasu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000679d.bin
b13194b43403744b9eba51ca9c33f9bacd5032aceaf4bf2f6a3ef9ebd9e1830a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x679D 5344 bytes
font_01_sfnt_off000079b7.bin
76816f9264b36467b8b1e5070125f14340cc16419b6960b46db76af71d556f57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79B7 9712 bytes
font_02_sfnt_off00009ae2.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AE2 4324 bytes

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