Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdbf376cc35d30e7…

MALICIOUS

PDF

41.4 KB Created: 2020-08-13 05:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09d922ef24f534e93189dc6a7a0dc12a SHA-1: 76369e6e8064ac13a406c569d3767324e3ae7069 SHA-256: fdbf376cc35d30e762ef6fde47c4169dbd0327dad67a97b51a79dcd40c504a79
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body and embedded links promote a fake download for 'Foxit pdf reader', which is a common lure for phishing or malware delivery. The primary malicious URL identified is https://ttraff.com/pify?keyword=foxit+pdf+reader+full+version+free+download, which is likely used to redirect the user to a malicious payload or phishing page.

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=foxit+pdf+reader+full+version+free+download
    • http://wofudaw.eacenter.org/uploads/1/3/1/3/131383837/doletiwijikuvinufe.pdf
    • http://files.cmtyfedchurch.org/uploads/1/3/1/4/131483266/905cff.pdf
    • http://nasexe.backstagesaloncroton.com/uploads/1/3/0/7/130775841/sewud_xosanem.pdf
    • http://files.chicoareaflyfishers.org/uploads/1/3/1/4/131438211/nomosefibesena-dodotutole.pdf
    • http://tanuzon.ulverstonoutsiders.org/uploads/1/3/2/7/132740328/nukamazonuvi_wuden.pdf
    • https://cdn.shopify.com/s/files/1/0431/8566/8255/files/vazerafezopudajen.pdf
    • https://cdn.shopify.com/s/files/1/0449/7162/2559/files/periodic_table_black_and_white_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/9241/0525/files/10375415342.pdf
    • https://cdn.shopify.com/s/files/1/0434/6540/8662/files/89830436569.pdf
    • https://cdn.shopify.com/s/files/1/0434/2031/9893/files/inner_sea_combat.pdf
    • https://cdn.shopify.com/s/files/1/0435/5486/5320/files/73445697672.pdf
    • https://cdn.shopify.com/s/files/1/0431/3425/5265/files/zavof.pdf
    • https://cdn.shopify.com/s/files/1/0429/9443/4202/files/28866040364.pdf
    • https://cdn.shopify.com/s/files/1/0429/6451/7023/files/langman_s_medical_embryology_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/9703/0805/files/77508174155.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/22650439267.pdf
    • https://cdn.shopify.com/s/files/1/0444/6869/9303/files/etiologia_de_la_diabetes_gestacional.pdf
    • https://cdn.shopify.com/s/files/1/0427/6014/3014/files/bbbee_scorecard.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_off0000638f.bin
3981f78646f8ea9b4fe5f1031f3e363d60d4ee9c8921f21bd55e5afac6654667		 pdf-font-stream PDF embedded font (sfnt) at offset 0x638F 5212 bytes
font_01_sfnt_off00007574.bin
03392a67d4f321a19f9bdbd1f1b88c91939f9e0fb74655e1b763b7dd7a1443fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7574 10216 bytes

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